24 hours ago I was totally new to the led world now I have a clear understanding of building my new light kit....Thank You to all you guys!
3500K or 4000K are usually recommended for a full grow. The strips come in 3000K, 3500K, 4000K and 5000K
The 4 ft Samsung strips have 72 diodes, if I'm not mistaken. 25 strips (as I suggested above) would be 1800 diodes. That's just 24 diodes short of 6 quantum boards. My fixture is for a 2x4 ft space and has a total of 880 diodes. I'm also running mine pretty soft, less than ten watts per strip (18 two ft strips total) When I get a chance to pick up a light meter, I'll make a light map of its coverage and post it.
The math is off I think for the whole room at least. If you covered the space with 6 qb260 fixtures like I was saying that would actually be 12 boards. 12 boards is 3,648 diodes. Twice as many as 25 strips. I guess 50 strips would be a similar amount of actual leds. Your fixture is about as many leds as 2 1/2 boards. That would kick ass in a 2x4. I use 608 diodes to cover half of my 4x4 but they're pretty high power at 270 watts or so. I'm only a little down from full tilt on the dimmer.
The qb120 fixtures have proven to me that these diodes are capable of a lot more efficiency at 24 volts and low power. My veg lights have amazing coverage and run cool. My bloom light not so much. It's pretty darn warm. It is many more diodes at higher power but you can just tell that the 24volt boards are making light with less waste.
Well, regardless of the actual diode count, a 4 inch spacing gives you a 4x8 coverage area with 25 of them. 4 inches is a little wider spacing than mine, but mine are not the F series, they are Acuity strips - advertised efficiency is only 120 l/w rather than 171. The 4 footers are 8800 total lumens each. That's 220,000 lumens, more than equivalent to a 1000W HPS output at only 625W. You could certainly go with more, I just don't think its necessary. You could do 50 strips and run them at 450 mA - you'd get about the same amount of light for under 500W instead of 625.
The EB strips are what I am using (building/experimenting with) I went with 8 3000K and 4 5700K on dimmable drivers. 156 Lumens/Watt @700mA 134 Lumes/Watt @1400mA, $10 a strip. So basically $120 for the strips, $120 for the Mean Well drivers resulting in a poor mans QB with a power range of 42 to 420 watts for $240 (not including the heatsinks, frame, cooling, misc and labour). I am using linear heat sinks and active cooling via a vented hood, at max I will likely drive these at half power. This strip build thread is a good one and covers wiring errors and drivers etc. Bridgelux EB-series on a 2' x 4' SCROG
Spectrum King LEDs are the way to go! Best resin production, high yield, and they are water proof! No worries of moving parts and breaking at high humidity levels or by foliar sprays. Easy to clean glass and low heat output. Average 2 grams per watt, and the 600w covers 5x5 perfectly. Full Spectrum LED Grow Lights | Spectrum King LED
Sure I have built some cob lights. I build them in 200w modules. 4 cxb3590 36v 3000k with a meanwell hkg-185h-c1400b driver. I use heatsinksusa 5.886x18" for two cobs so I have two each. I connect it all together in a project box like this one and mount drivers remotely using 18 gauge security cable two conductor. Hope that helps. I also build other led lights Sent from my LGUS991 using Tapatalk