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Diamond series is my preference. It really is a great unit.
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Thanks for all the info here, this thread is priceless.
I couldn't find anything but guesses regarding minimum canopy distance of the lights - anyone has any info on how close they can be put to the plants?
Can i get much better penetration with several low watt units instead of a few higher ones? Was thinking of getting 2x300 or 4-5x100 from diamond series - if i can get closer with the 100ws.
Or maybe individual LED power matters only, and each unit needs the same distance?
I have had my light at 15" to maybe 18-19" and gotten good results. I have also gone closer and gotten bleaching from the light, so I had to back it off a bit.
Wattage is a measurement of Voltage x Amperage = Watts... LED's are driven at a constant current. If you attempt to drive via a wattage pull or voltage you WILL have thermal runaway causing your LED's to overheat and burn out or cause your power supply to burn out/explode... yes they can and will explode. 1 Watt LEDs are driven at or about 200-350mA. 3 watt LEDs are driven between 600-750mA. The voltage pull depends on the chemical coating on the diode. Reds tend to be ran at a lower voltage thus have less "watt usage" than blues and whites. There are exceptions to this but that is the basics.
I've said this before, it is MUCH cheaper to find one of these Chinese companies to produce the light with your spectra and much less chance of you injuring yourself/family/home. If you have all of the required knowledge to do the wavelengths, electrical engineering, thermal management, and construction... it's cheaper to buy them 100% of the time.
As for the angles, 120 degrees is the base Lambertian pattern that LEDs give off... that means you have no secondary lenses and you may lack penetration for plants over 18-24 inches in height. The smaller the angle the less coverage you get but higher penetration. This also means that with tighter angles you can bleach or burn the upper leaves and colas.
Not sure where you got those from but nearly all of them are off by 5-10nm (except for Chloro A and B).Regarding useful spectra - here are some numbers (probably been posted already, just to make it easier)
beta-Carotene 450nm & 480-485nm
Chlorophyll a 430nm & 662nm
Chlorophyll b 453nm & 642nm
Chlorophyll d 710nm(*)
Chlorophyll f 706nm(*)
Phycoerythrin 590nm
Phycocyanin 625nm
Emerson effect 670nm & 700nm.
(*) Not sure if needed for our girls
I believe I mentioned it before in this thread and definitively within this forum, that you are not very likely to get the information you are asking for from anyone. Those of us that have actually done research and testing have put in hundreds to thousands of hours and tens of thousands of dollars (at least in my case) trying to figure out those questions.
Rest is from one of the lamp's brochure im thinking of buying.
Wow... we're lucky the scientists discovering chlorophyll did not think that way!