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11-30-2008, 07:58 AM #11Senior Member
Building LED lights from facts, no theories
Appreciate the advice. I am an electronics hobbyist and don't work in the field, so I can always use some good help.
I bought a bunch of P4s, blue and cool white really cheap, so I am stuck with them. I was planning on using them with red K2s, but will probably need to buy some more reds. I might try the Crees and see if I can get a comparison.
Regarding Cree Vs Luxeon: Isn't a higher VF better? Since you will be running a higher wattage at same current.
I try to be pretty conservative on the current. Don't like to run at more then 60% of max.
I do a couple weeks of break-in during array building process.
The array I am building will have several panel current meters, so I can monitor overall current plus each string.
What are your thoughts on where to operate on current curve? What do you think is the sweet spot where you are trading off efficiency for better penetration? I am setting my rig up so I can play around different current settings and see what produces best yield/watt.
It wouldn't surprise me if we have to run these guys as close to max as possible and use aggressive cooling.
I think with LEDs we are going to have to start tailoring the grow to fit the light. We need to start thinking a little more 3D about productive growth area then we do with HPS. Maximizing available light in the Z axis is the real limiting issue with LEDs. You probably only have a couple of inches of decent penentration with LEDS. If you can somehow increase that to 4 or 5 inches you should be able to double yield in the same square footage.
I am currently playing with growing horizontal /flat plants, trying to keep the canopy depth within 6 inches.
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