Electronics > Beginners
grow led diy
nowlan:
I have a cob led over my reef tank, driven by 700ma meanwell LPC driver, and passive cpu heatsink.
https://www.digikey.com/product-detail/en/bridgelux/BXRC-30E4000-F-23/976-1255-ND/5180227
james_s:
Lumens are essentially meaningless for non-white light anyway, and the specs on random Chinese LEDs are usually just made up numbers having little to no relation to what the parts are actually capable of. Some of them are quite good, others are not, you can't really tell from the specs though.
Zero999:
--- Quote from: honeybadger on March 15, 2019, 11:39:17 pm ---The blue-red combo it is most useful for chlorophyll only but there is a lot more.
Check this: https://en.wikipedia.org/wiki/Photosynthetically_active_radiation#Yield_photon_flux
--- End quote ---
I know, but I maintain blue and red are the most important colours. It depends on the application. If he's just trying to suppliment existing natural light i.e. grow plants indoors near a north facing window, then I don't see why red and blue LEDs won't do.
And I've corrected my previous post: plants need more red, than blue light, rather than the reverse.
honeybadger:
--- Quote from: Zero999 on March 16, 2019, 07:55:37 am ---... I don't see why red and blue LEDs won't do...
--- End quote ---
It will look like in a whorehouse :-DD . I had a DIY blue-red combo few years ago. Full spectrum is the only way.
And you won't be able to find most efficient blue and red LEDs. All the efficiency development is focused on white LED. And efficiency is the most important factor there is.
Zero999:
--- Quote from: honeybadger on March 16, 2019, 01:03:54 pm ---
--- Quote from: Zero999 on March 16, 2019, 07:55:37 am ---... I don't see why red and blue LEDs won't do...
--- End quote ---
It will look like in a whorehouse :-DD . I had a DIY blue-red combo few years ago. Full spectrum is the only way.
And you won't be able to find most efficient blue and red LEDs. All the efficiency development is focused on white LED. And efficiency is the most important factor there is.
--- End quote ---
Who cares what it looks like?
Using separate red LEDs is more efficient because it cuts down on the losses when blue light is converted to longer wavelengths in the phosphor: look up Stoke's shift. Producing lots of green and yellow light is also wasteful because it's just reflected by the chlorophyll, rather than used for photosynthesis. If plants used green light for growth, then they wouldn't reflect it, so would be a different colour than green.
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