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LED Retailers...

stoned78

stoned78

Active member
PetFlora said:
See my 2 plants in a 3 x 3. The one on the right would cover the entire tent if not for the other plant. If growing sats you might get 3 to a 4 x 4. Basically, cramming a bunch of plants into an area means very little light penetration

https://www.icmag.com/ic/showthread.php?t=327901

or my Transcend Light thread (2 x 4 8 tube hot5) which is 5 x 5. 3 plants take the entire width

https://www.icmag.com/ic/showthread.php?t=313648

When you buy high intensity leds (like Amare Tech) ~ 300w will replace a 600w hps

hth
Click to expand...

I understand you have been playing around with t8 led tubes?
I have been searching around for some good quality info about these as I see some shops starting to replace ordinary aquarium 6500k fixtures med the led ones.
Seen some bad results compared to old ordinary tubes so I put the idea on hold for a while.
If anyone can change my mind on that one?

The question is does the big commercial grows run leds? ... we are talking the big ones that need service like this.

http://www.triqsystems.com

If the big guys do not use leds in any of their production .... im guess not going to aswell. they must know what they are doing.
a big commercial grow place somewhere it is leagal and someone only in it for the money....there you will find the best light?

are leds used in other commercial greenhouses on plants with similar requirements as cannabis?
 
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stoned78

stoned78

Active member
Here is a small one year old article from ledsmagazine:

http://www.ledsmagazine.com/article...ves-rapidly-growing-horticultural-market.html

the one year old article says research is far from complete....so are we there yet?

I see it in commercial use but only certain plants and as supplement for greenhouses or a small corner of growhouses for seedlings.

more articles from ledmagazine:
http://www.ledsmagazine.com/_search?q=grow&x=0&y=0

these osram oslon sll leds looks good? any lightfixtures use these? (they come in 440, 660 and 730nm with a spectrum and spread to admire)
http://ledlight.osram-os.com/applic...led-lighting/horticultural-lighting-products/

yummy spectrum and spread:
http://www.osram-os.com/Graphics/XPic5/00199213_0.pdf/LH CP7P (EnglishDeutsch).pdf

allready selling:
http://eu.mouser.com/ProductDetail/.../ta/xzc7LHeouPAt7m0NSEGpdIJQo/Szaix2nY1dHUw==

here is the cree selection of horticulture leds:
http://www.cree.com/LED-Components-and-Modules/Applications/Color/Horticulture

Same goes for the best Hps bulb. Rough put find the bulb sold most for commercial grow use in industry and you will about find the best one? follow the money
 
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Koondense

Koondense

Well-known member
Veteran
Commercial growers usually have large spaces and high ceilings, so need high intensity lights(higher penetration). For that a 600-1000w hps is better than leds, also the initial cost is higher with leds.

But if you grow small scale commercial or for personal use, i think a good led setup is the way to go.
My experience is very limited but i had great results with diy cree cxb3590 3000K, an average 1,5g/W on two different runs.
I can assure you'll be very happy with diy if you go that route.
 
stoned78

stoned78

Active member
Koondense said:
Commercial growers usually have large spaces and high ceilings, so need high intensity lights(higher penetration). For that a 600-1000w hps is better than leds, also the initial cost is higher with leds.

But if you grow small scale commercial or for personal use, i think a good led setup is the way to go.
My experience is very limited but i had great results with diy cree cxb3590 3000K, an average 1,5g/W on two different runs.
I can assure you'll be very happy with diy if you go that route.
Click to expand...

No doubt im on the led wagon very very soon.. :) Im just very picky and very skeptical as a person.
Grow ledlamp market is flooded with various info and confusing:)

any lamps use the osram oslon ssl leds? have a feeling they (or similar) would be in my first ledlamps
 
PetFlora

PetFlora

Well-known member
ICMag Donor
Veteran
stoned78 said:
I understand you have been playing around with t8 led tubes?
I have been searching around for some good quality info about these as I see some shops starting to replace ordinary aquarium 6500k fixtures med the led ones.
Seen some bad results compared to old ordinary tubes so I put the idea on hold for a while.
If anyone can change my mind on that one?

The question is does the big commercial grows run leds? ... we are talking the big ones that need service like this.

http://www.triqsystems.com

If the big guys do not use leds in any of their production .... im guess not going to aswell. they must know what they are doing.
a big commercial grow place somewhere it is leagal and someone only in it for the money....there you will find the best light?

are leds used in other commercial greenhouses on plants with similar requirements as cannabis?
Click to expand...

About 3 years ago I used some t8 leds; 5000k + 3000K, BUT, they required rewiring (bypassing the fixtures internal drivers. HOT5 leds are now available as direct replacements, used without bypassing and have much higher output
 
stoned78

stoned78

Active member
im not sure if leds work like hps and mh.... the use of gasses to create the spectrum. gasses burn at different temps. so when you dim you halide or hps spectrum will change accordingly? is it like that? its something with phosphor coating on mh? does the coating change spectrum with power given to lamp (less heat different spectrum)? so if I dim a 600w MH to 250w a different spectrum will occour?
if so could that be used to advantage with the socalled dual spectrum bulbs? (crank down to 250w and you will have more 450nm and all up more 660nm?

in poultry led light they show here what happens when you dimm their lamps....wonder if these lamps contain only one kind of led...and that simply changes spectrum when dimmed because of temperature of led?
if so you could change spectrum of led by amount of power given to it?

https://www.google.dk/search?q=agri...h&q=agrishift+leds+used&imgrc=o545EbKUY0dKXM:

some day it would be cool to control your light spectrum like you today control smarthome rgb/w led bulbs and ledstrips with phone app.
I use these milight led bulbs and controllers for my home (cheap philips hue) .... imagine toying with spectrum like an sound eq:)
so instead of colorwheel you would have spectrum. or be able to turn off or dim the 660nm leds in ledfixture for veg times etc. even seedlings. and so on.
someone make that:) even just 2 settings veg and flower would be fine:)
 
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A

Arf

Member
Cree are about to release a new 200W COB, as a result the price of CXB3590 are dropping. So check your favorite retailer over the next couple of weeks.
 
Koondense

Koondense

Well-known member
Veteran
I heard of it and was wondering how similar to the Citizen design will it be. Maybe nothing alike but we'll see.
Still got mixed feelings on such powerful cobs, how to cool them properly and so on...
 
zachrockbadenof

zachrockbadenof

Well-known member
Veteran
Arf said:
Cree are about to release a new 200W COB, as a result the price of CXB3590 are dropping. So check your favorite retailer over the next couple of weeks.
Click to expand...

cree... I am using their led's as replacements for lighting in my house...living room,kitchen/bedrooms/etc... its been a bit over a year, and so far out of maybe 20bulbs, '4' have died... yes they have a pretty good customer service, and have replaced all the defective bulbs, but that's a pretty shitty average ... not very impressed with cree...
 
P

pazi

New member
Koondense said:
Commercial growers usually have large spaces and high ceilings, so need high intensity lights(higher penetration). For that a 600-1000w hps is better than leds, also the initial cost is higher with leds.

Is this because HPS lights are more efficient (have higher PPF/W - photosynthetic photon flux per watt) than LEDs but from a highly concentrated source, so they need to be located at a greater distance from the plants?

Or HPS lights have a broader beam angle so their light enters the plants from various angles? - but then LEDs with a wide angle lens or without a lens should have similarly good "penetration".

I always wonder what people think causes "penetration": high PPFD or light entering the plants from many different directions?

My unproven theory is that plants can utilize higher PPFD generated by a diffuse light source. So I think the reason HPS lights work better in large spaces with high ceiling is that most of the PPF generated by the wider beam angle HPS lights land on plants while in a home environment a lot is wasted. This loss makes narrow beam LEDs seem more efficient in small spaces. So the real question is the total PPF of HPS vs total PPF of LEDs.
And if LEDs are still better, then wider angle lenses (or no lenses) should be used in large spaces.
Click to expand...
 
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