LED Lights

jesus · Post by **jesus** » Thu Jan 17, 2013 12:06 pm

Ok now I got quite a few results at 50k lumens, more if you use a super hps.

I can add a few more LEDs.

Intrinsic · Post by **Intrinsic** » Thu Jan 17, 2013 2:27 pm

jesus H Christ! this sounds cool. wanna to hear and see more on yer hardware as you move along.

deran · Post by **deran** » Fri Jan 18, 2013 7:50 am

ya know jesus - mess with the best - die like the rest :D

in terms of lumens ^^

you can name them as you like; im pragmatic for such things ... blowin 400 W an hour through a bulb, it has to perform best with lumens; learned it the hard way

had some cheapo hps bulbs once ( 2 for the price of 1 greenpower) and plants didnt wanted to peprform as i was used to; things changed radically when i switched back to the greepower bulb; i dont know - its my personal "standard" bulb , all other bulbs need to compete with it and to proof if they are better; still didnt came across a dignified replacement

Post by **Jesús Malverde** » Wed Jun 18, 2014 1:30 pm

http://www.technologyreview.com/view/52 ... iv+Blog%29" onclick="window.open(this.href);return false;

bentech · Post by **bentech** » Wed Feb 04, 2015 11:32 am

good article malverde

its seems that determining which led's combinations is correct and proper for a specific plants grow needs a rocket scientist ability to feret out

the marketting of unit commercially available are certainly of no use other than faith

i would build one
had i any clue as to what lights i should be assembling

Post by **Jesús Malverde** » Wed Feb 04, 2015 2:50 pm

The optimized specific wavelegths for individual plant species thing is probably overblown. I'm not saying its not real, but cannabis will, I'm sure, grow fine under a general use mix of wavelengths--e.g. agriculture specific LEDs not tuned to any particular plant. Just as cannabis does fine in soil using general purpose fertilizer, and the bulk of claims made for cannabis specific fertilizers are hyperbolic. Remember, all plants evolved growing under the same spectra so there's a strong normative selective pressure dating back to the origin of terrestrial life. The advantages of LEDs are are essentially thermodynamic in nature, they are more thermodynamically efficient which in real world terms simply means they create less heat per useful lumen. If your grow environment is cool enough to benefit from heating, it's actually pretty much a wash between incandescent and LED lighting in an important sense. If, on the other hand, your grow environment requires cooling, then the LEDs gain a large advantage.

bentech · Post by **bentech** » Wed Feb 04, 2015 3:38 pm

isnt there also the effecency gain in watts used to lumens produced compared to HPS and MH?

dont LED's produce the same light for half the electric cost of HID?

Post by **Jesús Malverde** » Wed Feb 04, 2015 6:31 pm

Yes, and yes(ish). The wasted electricity though in incandescents heats the room so if the grow space is heated anyway by an electric heater there are likely to be no real savings.

bentech · Post by **bentech** » Mon Feb 09, 2015 12:16 am

what do you think of jesus choice in numbers of lamps and spectrum?

im looking to build an array suitable for a 3x3 flowering box
what the best choice these days for diy?

Intrinsic · Post by **Intrinsic** » Mon Feb 09, 2015 12:48 am

jesus's
"of white LED's, both warm and cool white"
spectrum sounds good to me.

i use floros as yanno, alternating warm and cool whites tubes. works ok.
I don't see how using LEDs would be different in choosing spectrum.