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Old 03-16-2019, 08:24 AM #21
Alexphillips
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there are many LEDs which are better than HPS bulbs. Marshydro, Platinum, Viparspectra, Kind LED are some of the good manufacturers of LED grow lights. Choose any brand and save money on electrical bills.
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Old 03-16-2019, 01:49 PM #22
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From Black Dog LED Site:

"Various artificial grow light technologies create different light spectrums. LED grow lights differ significantly from other forms of artificial plant lights in that the spectrum can be tuned, eliminating unwanted excesses of light wavelengths (colors) while providing light plants can use most efficiently. Other artificial lighting technologies produce much of their light as an unintended and unavoidable byproduct of how they operate, ultimately wasting energy in heating up plant leaves.

When a photon of light hits a plant leaf, it can either be reflected or absorbed. Reflected photons will not affect the leaf temperature at all, but physics dictates that all photons absorbed by the leaf will increase the leaf temperature; how much depends on the energy (wavelength) of the photon and whether or not some of that energy was used to trigger other chemical reactions, such as photosynthesis. Photons fully utilized by the plant in chemical reactions will heat the leaf less than photons which are absorbed but not utilized. Therefore, measuring leaf surface temperature indirectly measures the efficiency of the light spectrum for growing plants-- less-efficient spectrums will tend to heat the leaf more, while more-efficient spectrums will heat the leaf less as more of the light energy is being converted to chemical energy.

High Pressure Sodium (HPS) in particular converts a significant portion of the energy consumed by the light directly to non-visible infrared light in the 810-830nm range, peaking about 819nm. This infrared light is perceptible to you (and plants) by the warmth it creates when exposed to the light. Additionally, much of the visible light HPS bulbs produce is yellow and not highly-utilized by plants. This radiation not used for photosynthesis or other chemical reactions only serves to heat up the leaves, requiring cooler ambient temperatures to keep the plants' leaves at their ideal temperature."
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Old 03-16-2019, 03:01 PM #23
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People, please stop with this nonsense.

The mentioned brands are really not much better than hps. And quoting Black Dog leds is nonsense when you say you use a white led light fixture, it's a totally different product with different spectrum.

Also saying lumens from a hps vs led can't compare(but you need a par meter), you clearly need to dig deeper in the matter because there are many truths to be found.

It's been at least three good years since the cob revolution and two years since the QB evolution and it goes the same way... certain white leds are the best photon production tech for the electric input. Period.
These certain models are cree cxb cobs, bridgelux vero cobs, citizen cobs, samsung smd... and that's pretty much it. If a fixture has these parts, it will almost certainly make much more and better spectrum light than any hps light.
If a fixture has other led parts, it will most certainly be in the same or similar league as a regular hps, from the light output per watt point of view.

Anything else is mostly unrelated business people nonsense talk to make you believe one product is much better than any other brand/product.

Basics comes first, remember that.


Cheers
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Old 03-16-2019, 03:06 PM #24
Platinumtitty
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Bait much?

Quote:
Originally Posted by Koondense View Post
People, please stop with this nonsense.

The mentioned brands are really not much better than hps. And quoting Black Dog leds is nonsense when you say you use a white led light fixture, it's a totally different product with different spectrum.

Also saying lumens from a hps vs led can't compare(but you need a par meter), you clearly need to dig deeper in the matter because there are many truths to be found.

It's been at least three good years since the cob revolution and two years since the QB evolution and it goes the same way... certain white leds are the best photon production tech for the electric input. Period.
These certain models are cree cxb cobs, bridgelux vero cobs, citizen cobs, samsung smd... and that's pretty much it. If a fixture has these parts, it will almost certainly make much more and better spectrum light than any hps light.
If a fixture has other led parts, it will most certainly be in the same or similar league as a regular hps, from the light output per watt point of view.

Anything else is mostly unrelated business people nonsense talk to make you believe one product is much better than any other brand/product.

Basics comes first, remember that.


Cheers
Theres so much info on the site that could answer that question and any gardner that messes with 600 watts or above will know something about LEDs and virtually nothing. Lol. Idk. Looks like a bait thread. Because if I were looking for advice then id say dont look for black dog to be the most efficient or the best...and some might say way overpriced. Lol. Ok. Ramt over. My bad
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