AvidLerner
Member
I am hoping some of my friends from another location find me back here my favorite place to share
Samsung LM561C two channel 100w PC Board
- Thread starter AvidLerner
- Start date
saitama
Well-known member
Here are four boards each over a 2x2 area all running at full power 200w.
Enjoy
Are you powering the fan with a separate PSU?
AvidLerner
Member
Yes. I use a meanwell APV12-12 1amp 12v 1 amp driver great for at least four fans. I have three locations with lights
AvidLerner
Member
After I retired all my cob's I had all of these HLG-185H-C1400B drivers at least three or four.
In decided to experiment before I would commit to building PCB's to save a lot of money and aggravation.
I decided to use flxible strips over hard strips as teh flexible strips are easier to create various formulae such as 32S6P. I practiced with 49S8P which yields the same outcome as the previous model, with more current.
I will spare you the math.
I order flexible strips of Samsung LM561C diodes from here ->https://mufue.en.alibaba.com/?spm=a2700.8443308.0.0.NoIvyo
Shenzhen Mufue technologies Roget Zheng. I purchased 20m 10m 5000k 80cri and 10m 3000k 90cri. These are all 24v Constant Current strips which will behave identical to any PCB built, only the diodes are more spread out so the PAR numbers will be lower due to Physics. I will save you that as well. Just know it is correct.
Flexible strips come in precut segments. Each segment has seven diodes in series, so they are 200mA with 2.9x7 = 20.3vf per segment.
math time:
143Vf / 20.3 = 7.04 so lets say 7 segments using 49 diodes.
7 x 20.3 = 142.1Vf demand / 143 = 98% demand. quite efficient.
Now we have Vf resolved with a set segment length now it is time to decide how hard to run the diodes. I want to run them below 200mA and above 150mA if possible.
1400/165 = 8.48. So If I use 8 rows or parallel strings I will get 175 mA per row. I can lower that by adding an extra row say nine rows now so 1400/9 = 155.55mA not bad.
math over: back to design
based on this I can now build a light from flexible strips using 7 segments long by 9 rows wide
So I can cut nine seven segment strips and connect therm all in parallel to create a 200w fixture.
I have a total of 441 diodes operating around 195-200lm/w the driver is driving close to 200w so we can estimate that at 200w the flexible strip fixture is delivering 40,000lumens in a 18"X12" area.
Not bad.
It was from here I used up all my cob drivers 1400mA for the flexible strips and experimented to get the best effect from a PCB fixture light engine.
So here is another activity to try for a couple hundred bucks total cost. I mount these flexible strips on cookie sheets, 1/8" th x 3/4" wide aluminum flat stock with no heat issues or any other light gauge you can think of. Cookie sheets work best and cheapest. I build these for cloning vegging and they can bloom too at 200w.
You can build these just talk to Roget Zheng, great gentleman and he even makes rigid strips too, every imaginable color or spectrum you could think of he has all in Samsung LM561C format even specific spectrum like far Red Deep Red Royal Blue etc.
enjoy
In decided to experiment before I would commit to building PCB's to save a lot of money and aggravation.
I decided to use flxible strips over hard strips as teh flexible strips are easier to create various formulae such as 32S6P. I practiced with 49S8P which yields the same outcome as the previous model, with more current.
I will spare you the math.
I order flexible strips of Samsung LM561C diodes from here ->https://mufue.en.alibaba.com/?spm=a2700.8443308.0.0.NoIvyo
Shenzhen Mufue technologies Roget Zheng. I purchased 20m 10m 5000k 80cri and 10m 3000k 90cri. These are all 24v Constant Current strips which will behave identical to any PCB built, only the diodes are more spread out so the PAR numbers will be lower due to Physics. I will save you that as well. Just know it is correct.
Flexible strips come in precut segments. Each segment has seven diodes in series, so they are 200mA with 2.9x7 = 20.3vf per segment.
math time:
143Vf / 20.3 = 7.04 so lets say 7 segments using 49 diodes.
7 x 20.3 = 142.1Vf demand / 143 = 98% demand. quite efficient.
Now we have Vf resolved with a set segment length now it is time to decide how hard to run the diodes. I want to run them below 200mA and above 150mA if possible.
1400/165 = 8.48. So If I use 8 rows or parallel strings I will get 175 mA per row. I can lower that by adding an extra row say nine rows now so 1400/9 = 155.55mA not bad.
math over: back to design
based on this I can now build a light from flexible strips using 7 segments long by 9 rows wide
So I can cut nine seven segment strips and connect therm all in parallel to create a 200w fixture.
I have a total of 441 diodes operating around 195-200lm/w the driver is driving close to 200w so we can estimate that at 200w the flexible strip fixture is delivering 40,000lumens in a 18"X12" area.
Not bad.
It was from here I used up all my cob drivers 1400mA for the flexible strips and experimented to get the best effect from a PCB fixture light engine.
So here is another activity to try for a couple hundred bucks total cost. I mount these flexible strips on cookie sheets, 1/8" th x 3/4" wide aluminum flat stock with no heat issues or any other light gauge you can think of. Cookie sheets work best and cheapest. I build these for cloning vegging and they can bloom too at 200w.
You can build these just talk to Roget Zheng, great gentleman and he even makes rigid strips too, every imaginable color or spectrum you could think of he has all in Samsung LM561C format even specific spectrum like far Red Deep Red Royal Blue etc.
enjoy
AvidLerner
Member
AvidLerner
Member
These pcbs make no real heat. Here is two 200w pcbs on the bottom level and another level above another two 200w flexible strip fixtures for a total of 800w stacked with no heat issues
The smaller plants have no issues from the lights below and provide another 400w above. Total 800w stacked
The smaller plants have no issues from the lights below and provide another 400w above. Total 800w stacked
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AvidLerner
Member
Explore and control LED-based tunable-white lighting
Two-color sources can enable tunable-white light, explains ISHITA GOSWAMI , but more colors can provide a broader tunable range, better quality light, and granular intensity control.
Solid-state lighting (SSL), leveraging white LEDs, has disrupted markets for traditional lighting products for some time now. With the transition to this energy-saving lighting technology, vendors have been able to offer cool, neutral, and warm white shades that have been quickly understood and accepted by consumers and professional buyers. But LED sources also afford luminaire manufacturers the ability to offer intelligent products that can be tuned to a desired CCT at any time by the user of a space. Let’s discuss why the time is right for tunable LED-based products and how such products can be designed for optimum tuning range, light quality, and intensity control; and subsequently how such a product would be controlled.
Indeed, warmer white lighting, at lower correlated color temperatures or CCTs, is known to help establish a comforting or relaxing environment, which many people welcome early in the morning or in an evening setting. Cool or neutral lighting at higher color temperatures, on the other hand, can have an invigorating effect and therefore is often preferred in contexts such as industrial workplaces, offices, or kitchens to help enhance concentration and maximize human productivity. But SSL can offer flexibility beyond choosing a CCT based on a specific application and accepted lighting practices.
With LEDs affording the opportunity to experiment with light in practical situations, human responses to varying light specifications are becoming more widely understood. Industry and academia are engaged in exploring, demonstrating, and validating the benefits of human-centric lighting (HCL) in applications such as hospitals, retail stores, schools, and offices. Consumers are ready for
tunable white lighting, opening the way for groups such as architects, interior designers, lighting specifiers, and facility managers to use their knowledge of the effects of different white shades to inf luence human moods and behavior and so establish even better environments for working, living, healing, buying, and spending leisure time.
Differences in tunable white sources White LEDs are fabricated either by phosphor conversion of blue or near-ultraviolet emission, or by mixing light from multiple red, green, and blue (RGB) monochromatic emitters. A combination of these two methods is also sometimes used. Adjusting the phosphor-coating composition or color mixing causes the characteristic of the white light to vary. A tunable-white light source is characterized by how many colors or whites are used to achieve the final CCT. There are two, three, five, and even potentially seven color sources that can be mixed for tunable-white developments today, but the actual implementation depends on ease of use, quality, and cost.
The cool, neutral, and warm shades mentioned earlier are referred to as fixed or static CCT white lighting. Typical CCT ranges for warm, neutral, and cool white are 2700–3000K, 4000–5000K, and 5000–6500K, respectively. Together, these CCT ranges define a continuum of tunable-white CCTs that would be perceived as being white.
In a few tunable-white light sources using three or more colors, these white CCTs lie along the daylight locus (DL) and black body locus (BBL) that traverse the long-established CIE (International Commission on Illumination) color space and those sources provide a higher-quality white as defined by CRI, the R9 CRI red sample, and the relatively new TM-30 color-fidelity metric published in
2015 by the Illuminating Engineering Society of America (IES; http://bit.ly/2bBubZM).
Fig. 1, for example, charts the CRI and R9 values of a three-color Luxi Tune source over a broad range of CCTs. Other tunable-white color sources using a two-color cool-white and warm-white averaging effect are limited in the range over which they can deliver high CRI and high color fidelity.
Importance of path Each tunable-white solution has a predefined path or tuning profile. With three or more colors, it is possible to track the BBL as mentioned earlier and independently dim the intensity of the resulting white light. Two-color sources, on the other hand, follow a straight line over a limited tuning range, and the resulting f lux also has limitations due to the averaging effect of cool white and
warm white needed to strike the right CCT, which has to be compensated with adding more LEDs in the tuning mix.
Both options are currently considered suitable for creating tunable-white LED light engines or modules. However, it is generally accepted that a high-quality white should have no more than a two standard deviation color matching (SDCM) variation along the tuning path. A two-color solution cannot meet this expectation over the entire range of 2700K–6500K CCTs. It is also recognized that true white may lie above, on, or below the BBL, depending on the observer. This f lexibility of a tuning curve that is offset above or below the BBL by design is not possible with a two-color solution. Based on research and customer feedback, LED Engin has established a path for its own tunable-white LuxiTune products, which is within 2 SDCM below the BBL over the 2100K–4300K range and gradually transitions toward the daylight locus from 4300K–6500K.
Two-color sources can enable tunable-white light, explains ISHITA GOSWAMI , but more colors can provide a broader tunable range, better quality light, and granular intensity control.
Solid-state lighting (SSL), leveraging white LEDs, has disrupted markets for traditional lighting products for some time now. With the transition to this energy-saving lighting technology, vendors have been able to offer cool, neutral, and warm white shades that have been quickly understood and accepted by consumers and professional buyers. But LED sources also afford luminaire manufacturers the ability to offer intelligent products that can be tuned to a desired CCT at any time by the user of a space. Let’s discuss why the time is right for tunable LED-based products and how such products can be designed for optimum tuning range, light quality, and intensity control; and subsequently how such a product would be controlled.
Indeed, warmer white lighting, at lower correlated color temperatures or CCTs, is known to help establish a comforting or relaxing environment, which many people welcome early in the morning or in an evening setting. Cool or neutral lighting at higher color temperatures, on the other hand, can have an invigorating effect and therefore is often preferred in contexts such as industrial workplaces, offices, or kitchens to help enhance concentration and maximize human productivity. But SSL can offer flexibility beyond choosing a CCT based on a specific application and accepted lighting practices.
With LEDs affording the opportunity to experiment with light in practical situations, human responses to varying light specifications are becoming more widely understood. Industry and academia are engaged in exploring, demonstrating, and validating the benefits of human-centric lighting (HCL) in applications such as hospitals, retail stores, schools, and offices. Consumers are ready for
tunable white lighting, opening the way for groups such as architects, interior designers, lighting specifiers, and facility managers to use their knowledge of the effects of different white shades to inf luence human moods and behavior and so establish even better environments for working, living, healing, buying, and spending leisure time.
Differences in tunable white sources White LEDs are fabricated either by phosphor conversion of blue or near-ultraviolet emission, or by mixing light from multiple red, green, and blue (RGB) monochromatic emitters. A combination of these two methods is also sometimes used. Adjusting the phosphor-coating composition or color mixing causes the characteristic of the white light to vary. A tunable-white light source is characterized by how many colors or whites are used to achieve the final CCT. There are two, three, five, and even potentially seven color sources that can be mixed for tunable-white developments today, but the actual implementation depends on ease of use, quality, and cost.
The cool, neutral, and warm shades mentioned earlier are referred to as fixed or static CCT white lighting. Typical CCT ranges for warm, neutral, and cool white are 2700–3000K, 4000–5000K, and 5000–6500K, respectively. Together, these CCT ranges define a continuum of tunable-white CCTs that would be perceived as being white.
In a few tunable-white light sources using three or more colors, these white CCTs lie along the daylight locus (DL) and black body locus (BBL) that traverse the long-established CIE (International Commission on Illumination) color space and those sources provide a higher-quality white as defined by CRI, the R9 CRI red sample, and the relatively new TM-30 color-fidelity metric published in
2015 by the Illuminating Engineering Society of America (IES; http://bit.ly/2bBubZM).
Fig. 1, for example, charts the CRI and R9 values of a three-color Luxi Tune source over a broad range of CCTs. Other tunable-white color sources using a two-color cool-white and warm-white averaging effect are limited in the range over which they can deliver high CRI and high color fidelity.
Importance of path Each tunable-white solution has a predefined path or tuning profile. With three or more colors, it is possible to track the BBL as mentioned earlier and independently dim the intensity of the resulting white light. Two-color sources, on the other hand, follow a straight line over a limited tuning range, and the resulting f lux also has limitations due to the averaging effect of cool white and
warm white needed to strike the right CCT, which has to be compensated with adding more LEDs in the tuning mix.
Both options are currently considered suitable for creating tunable-white LED light engines or modules. However, it is generally accepted that a high-quality white should have no more than a two standard deviation color matching (SDCM) variation along the tuning path. A two-color solution cannot meet this expectation over the entire range of 2700K–6500K CCTs. It is also recognized that true white may lie above, on, or below the BBL, depending on the observer. This f lexibility of a tuning curve that is offset above or below the BBL by design is not possible with a two-color solution. Based on research and customer feedback, LED Engin has established a path for its own tunable-white LuxiTune products, which is within 2 SDCM below the BBL over the 2100K–4300K range and gradually transitions toward the daylight locus from 4300K–6500K.
AvidLerner
Member
part 2
Fig. 2 illustrates this tuning range. Flexibility in creating ambience By adjusting in-source color mixing to follow a curve such as that shown in Fig. 2, it is possible to deliver tunable-white light sources that permit smooth adjustment between the limits of extremely cool (high CCT) to extremely warm (low CCT). Some sources also allow the intensity to be dimmed from 100% to as low as 0.5%, at each CCT over the tuning range. This is known as CCT tuning with deep dimming. Moreover, natural human responses to phenomena such as sunrise and sunset have conditioned people to expect tones to be cooler when lighting is brightest and to become warmer as lighting is dimmed. Accordingly, retailers or owners of venues such as bars or restaurants often seek to attract customers by presenting a cool and invigorating environment during daytime hours, while using lighting to create a warm glow moving into the evening. This is another version of tunable white known as warm dimming.
Moving forward from the CCT tuning and dimming options that are possible today, one potential next step for tunable-white lighting is to introduce control over color saturation. This is known as Du ́v ́ tuning as represented in Fig. 3. Du ́v ́ tuning requires three control handles for CCT, intensity, and saturation. LED Engine has demonstrated Du ́v ́ tuning within the 7-MacAdam-ellipse rectangles of the ANSI white space along iso-CCT lines, using a DMX controller.
Control requirements and wireless options The prospect of tunable-white lighting raises questions as to how users can apply settings or adjust the lighting to achieve the effects they desire. In fact, the adoption of tunable-white lighting is tightly linked to ease of use which is in turn determined by how intuitive the controls are. A color-aware user interface is required that allows the user to
set f lux levels and CCT directly without having to interpret what settings on the control- ler correspond to actual f lux and CCT output.
A suitable control strategy needs to have two handles, capable of controlling CCT and intensity, independently and simultaneously. The basic LuxiTune light engine uses two 0–10V controls; 0–10V has been around in the lighting industry for a while. Although LED Engin has used DMX (both 512A and RDM) successfully for tunable white, DMX is not widely used outside professional or stage lighting markets. DALI (digital addressable lighting interface) is another alternative that is more popular in commercial markets, particularly in Europe. Currently, DALI protocols are available for managing one variable (Device Type 6, or DT6), or two (Device Type 8, or DT8), but DT8 devices cannot yet be certified by DALI.
The options for controlling tunable-white lighting continue to evolve and now include some important developments such as wireless connectivity. One opportunity may be to leverage the rapid pace of progress in the smart-building space. The ZigBee protocol has made some inroads in lighting. LED Engine has tested the tunable-white market with a ZigBee Home Automation (ZHA) enabled tunable-white solution. However, few if any ZHA controllers in the market today are suited for tunable-white applications as they lack the two separate handles for independently controlling intensity and CCT. Bluetooth Low Energy
(BLE) mesh networking promises advantages for tunable-white lighting including an end-to-end solution. Not only is it possible to have two independent control handles for CCT and intensity, the BLE control interface is user friendly, and lights can be controlled by an app on a smart device with touchscreen operation. Secure networks with four levels of access can be set up to control multiple light nodes that extend over large distances without requiring hubs or gateways, and can be controlled from a single terminal with minimal restriction on communication range.
Because all devices on a BLE network can advertise their presence and status, the controlling app can be allowed to access all lighting fixtures and groups of fixtures.
This feature would help in commissioning and managing a network of tunable light fixtures in a commercial environment spread across several f loors. Moreover, autonomous coordination between nodes and the ability to incorporate input from sensors, would provide the opportunity to implement advanced features such as activating lights in sequence as a person walks along a corridor. LuxiTune with the BLE mesh option can incorporate all these advantages for luminaire developers.
The market for tunable-white lighting may yet be too young for manufacturers to back one wireless option over another. One effective way to give luminaire product developers the flexibility to have multiple connectivity choices is a modular design. You can realize a f lexible scenario by having a basic 0–10V driver that works with different modular control boards such as in the tunable-white light engine shown in Fig. 4. This allows a tunable-white solution to be assembled and commissioned with minimal effort by plugging the chosen control module into headers on the basic driver board.
Future of dynamic lighting Lighting designers, luminaire manufacturers, and end users have become familiar with the effects that can be achieved by dynamic white lighting. The market is now ready to accept tunable-white lighting products capable of supporting even more varied effects. Some products have already been successfully realized. Other aspects need to come fully into place, such as the realization that dynamic lighting offers quantifiable benefits for applications in retail, healthcare, hospitality, commercial, and education. Control options for tunable white can be simplified with improvements such as BLE mesh, and intuitive controls are the key to enabling this exciting technology to deliver its full potential.
http://www.ledengin.com/files/articles/tunable_white_colors_control.pdf
Fig. 2 illustrates this tuning range. Flexibility in creating ambience By adjusting in-source color mixing to follow a curve such as that shown in Fig. 2, it is possible to deliver tunable-white light sources that permit smooth adjustment between the limits of extremely cool (high CCT) to extremely warm (low CCT). Some sources also allow the intensity to be dimmed from 100% to as low as 0.5%, at each CCT over the tuning range. This is known as CCT tuning with deep dimming. Moreover, natural human responses to phenomena such as sunrise and sunset have conditioned people to expect tones to be cooler when lighting is brightest and to become warmer as lighting is dimmed. Accordingly, retailers or owners of venues such as bars or restaurants often seek to attract customers by presenting a cool and invigorating environment during daytime hours, while using lighting to create a warm glow moving into the evening. This is another version of tunable white known as warm dimming.
Moving forward from the CCT tuning and dimming options that are possible today, one potential next step for tunable-white lighting is to introduce control over color saturation. This is known as Du ́v ́ tuning as represented in Fig. 3. Du ́v ́ tuning requires three control handles for CCT, intensity, and saturation. LED Engine has demonstrated Du ́v ́ tuning within the 7-MacAdam-ellipse rectangles of the ANSI white space along iso-CCT lines, using a DMX controller.
Control requirements and wireless options The prospect of tunable-white lighting raises questions as to how users can apply settings or adjust the lighting to achieve the effects they desire. In fact, the adoption of tunable-white lighting is tightly linked to ease of use which is in turn determined by how intuitive the controls are. A color-aware user interface is required that allows the user to
set f lux levels and CCT directly without having to interpret what settings on the control- ler correspond to actual f lux and CCT output.
A suitable control strategy needs to have two handles, capable of controlling CCT and intensity, independently and simultaneously. The basic LuxiTune light engine uses two 0–10V controls; 0–10V has been around in the lighting industry for a while. Although LED Engin has used DMX (both 512A and RDM) successfully for tunable white, DMX is not widely used outside professional or stage lighting markets. DALI (digital addressable lighting interface) is another alternative that is more popular in commercial markets, particularly in Europe. Currently, DALI protocols are available for managing one variable (Device Type 6, or DT6), or two (Device Type 8, or DT8), but DT8 devices cannot yet be certified by DALI.
The options for controlling tunable-white lighting continue to evolve and now include some important developments such as wireless connectivity. One opportunity may be to leverage the rapid pace of progress in the smart-building space. The ZigBee protocol has made some inroads in lighting. LED Engine has tested the tunable-white market with a ZigBee Home Automation (ZHA) enabled tunable-white solution. However, few if any ZHA controllers in the market today are suited for tunable-white applications as they lack the two separate handles for independently controlling intensity and CCT. Bluetooth Low Energy
(BLE) mesh networking promises advantages for tunable-white lighting including an end-to-end solution. Not only is it possible to have two independent control handles for CCT and intensity, the BLE control interface is user friendly, and lights can be controlled by an app on a smart device with touchscreen operation. Secure networks with four levels of access can be set up to control multiple light nodes that extend over large distances without requiring hubs or gateways, and can be controlled from a single terminal with minimal restriction on communication range.
Because all devices on a BLE network can advertise their presence and status, the controlling app can be allowed to access all lighting fixtures and groups of fixtures.
This feature would help in commissioning and managing a network of tunable light fixtures in a commercial environment spread across several f loors. Moreover, autonomous coordination between nodes and the ability to incorporate input from sensors, would provide the opportunity to implement advanced features such as activating lights in sequence as a person walks along a corridor. LuxiTune with the BLE mesh option can incorporate all these advantages for luminaire developers.
The market for tunable-white lighting may yet be too young for manufacturers to back one wireless option over another. One effective way to give luminaire product developers the flexibility to have multiple connectivity choices is a modular design. You can realize a f lexible scenario by having a basic 0–10V driver that works with different modular control boards such as in the tunable-white light engine shown in Fig. 4. This allows a tunable-white solution to be assembled and commissioned with minimal effort by plugging the chosen control module into headers on the basic driver board.
Future of dynamic lighting Lighting designers, luminaire manufacturers, and end users have become familiar with the effects that can be achieved by dynamic white lighting. The market is now ready to accept tunable-white lighting products capable of supporting even more varied effects. Some products have already been successfully realized. Other aspects need to come fully into place, such as the realization that dynamic lighting offers quantifiable benefits for applications in retail, healthcare, hospitality, commercial, and education. Control options for tunable white can be simplified with improvements such as BLE mesh, and intuitive controls are the key to enabling this exciting technology to deliver its full potential.
http://www.ledengin.com/files/articles/tunable_white_colors_control.pdf
AvidLerner
Member
Wanted to make folks aware there is a shortage of Smasung LM561C 300k and 3500k diodes towards the future. Only existing supply is available as Samsung is retooling their operations towards the LM301B diode which they are producing at a 25% cost increase $0.06/diode up fro $0.04 but only in 5000k spectrum.
If you are expecting any LM561C 3000k/3500k in he near future, don't hold your breath.
If you are expecting any LM561C 3000k/3500k in he near future, don't hold your breath.
AvidLerner
Member
I have been working again. I have designed and developed two new boards. Both ofhte4se boards are based on the Lumileds Luxeon SunPlus 20 series.
The first board is a two channel 75w Deep Red:Royal Blue 2:1 ratio two channel ech channel can be driven by a MW lpc-60-1050 non-dimmable driver for great red and blue channel for any setup using white light, be it cob's or qb's.
The scond board is a Far Red and UVA board another 65w board. The Far Red channels can bew driven by a lpc-60-1050 non-dimmable driver and the uva channel can be connected in series with the blue channel for three total channels available One Red, One Blue/UVA and one Far red;circadian channel.
they will be available in a few weeks after manufacturing is complete.
namaste
The first board is a two channel 75w Deep Red:Royal Blue 2:1 ratio two channel ech channel can be driven by a MW lpc-60-1050 non-dimmable driver for great red and blue channel for any setup using white light, be it cob's or qb's.
The scond board is a Far Red and UVA board another 65w board. The Far Red channels can bew driven by a lpc-60-1050 non-dimmable driver and the uva channel can be connected in series with the blue channel for three total channels available One Red, One Blue/UVA and one Far red;circadian channel.
they will be available in a few weeks after manufacturing is complete.
namaste
That is a 50% markup not including the end sellers markup. So for your light above that is a increase of $94.08 for a 4x4 area.
That is a huge cost increase for very little increase in efficiency. I dont see how that you could recoup the extra cost of going to the 301B chips.
I hope they get the 561C back in stock again. But this explains why it took so long to get my strips built. I needed 20K chips to build my strips.
studlybuds
New member
Math.
Math.
Hi, Mr. Lerner. I have benefited greatly from reading your posts in regard to LEDs, and I thank you for sharing your interest in math and its practical applications with us.
I would very much like to teach myself to understand that stuff, but it's been a long time since high school physics, algebra, calc; I wouldn't know where to begin. Would you say an electrical engineering course online (Khan Academy, etc.) would be sufficient to be able to run these calculates oneself, or do you have any particular reading materials you could recommend, perhaps?
Any suggestions you might be able to think of off-hand would be much appreciated. Thanks again for posting!
Math.
Hi, Mr. Lerner. I have benefited greatly from reading your posts in regard to LEDs, and I thank you for sharing your interest in math and its practical applications with us.
I would very much like to teach myself to understand that stuff, but it's been a long time since high school physics, algebra, calc; I wouldn't know where to begin. Would you say an electrical engineering course online (Khan Academy, etc.) would be sufficient to be able to run these calculates oneself, or do you have any particular reading materials you could recommend, perhaps?
Any suggestions you might be able to think of off-hand would be much appreciated. Thanks again for posting!
AvidLerner
Member
There is a web site that gets into the basics of strip design. It is a cannabis web site ledgardner.com There is a blog there that breaks down the basics of electronics. Plenty of good material in his blogs, then you can google most anything else.
And please call me Avid. I am old enough to be called sir but I like informal studybuds.
enjoy your jurney
AvidLerner
Member
I did the numbers and figured out real quick this was a slippery slope. Samsung is pushing this higher cost diode and slowing down production of their LM561C diode. Economy is slowing down so I can not complain. Korea follows market demands so it makes sense for them to slow down production. everyone is having a sale, except me.
peace
Yeah aint that the truth. I see that Meanwell drivers just dropped in cost around 10%.
AvidLerner
Member
I wrote an article on blog how I designed and built my flexible strips. here is the link to my blog. https://growgreenled.wordpress.com/2017/11/14/diy-flexible-strip-light-project/
AvidLerner
Member
I go to TRCelectronics and get a little more from thee folks. no connections just share where I get my best prices.
How is their shipping cost? I am looking at getting 10 HLG 320 42A drivers. I can get them from Jameco and Roget for $3 cheaper with free shipping than from TRC.
AvidLerner
Member
