I want to discuss a custom LED light with COB´s (chip on board) leds. It should be Luminous chips witch draw 140W from a wall and I will use 4. With Mean Well HLG 54V, 480W power supply i can run the chips with some (10 %) reserve on 2,03 Amps (108W) each. With optics with 93 % efficiency i can get 12 071 lumens from each chip and 48 284 lumens total. That´s 100,5 lm/W. In comparison with 630W cmh Lumatec witch efficiency is 111 lm/W that´s not bad-digital power supply is not so efficient instead i think. It is also pretty cheap light setup. Hardware (LED chips, DC power supply, optics) cost around 370 €-Luminous chips aren´t so expensive as Crees.
So it´s nothing new. And what do you think, are these chips good enough for 120x120 box?
I think this video is informative and i used it in my project.
I already bought the aluminium heatsink, 55 cm long, 3 pcs. First i thought i will grow in IKEA micro cabinet but it was too nice and the heatsink also. I will try maybe only 280 watts first but it’s not efficient setup then.
Exactly man, i researched more and i think best solution is now try 2 140W LEDs as i mentioned in last post with 320W driver. This is reasonable choice (HLG-320H-C2800A) and far more effective, it can pull 32 000 lumens. With some additional lighting it is enough for 1 sq. metre /400W tent. For 600W tent i will try Luminous horticulture LED in this setup.
For now i don´t know witch color temperature choose, 3000K or 3500K or mix (3000K and 4000K/5000K). This confuses me because i can´t find spectral diagrams.
COB’s arrived. Driver on the way. It is HLG 150W. I will grow in small cab first and can use it to run only 1 chip on full load later. Square optics i think should work well with these:
So far good. This light cost me 180 euro, but i have 2 aluminium heatsink more so i can upgrade to 6 chips (450W) in larger tent and it will cost not even 3 times more (1 euro/watt is possible). Do you have something to comparison, please?
150W of LEDs light doing its job. Pics tell for itself. Tent is 1sq meter. I can say 3500K has much blue in it, plants are bushy and compact. 3000K would be better for flower but it is not available at the mouser.com, I need to add some red/orange in the spectrum. BIN of COBs is 80 CRI.
Nice setup you have there! The plants obviously love it!
Those heat-sinks are massive & they really go with the hangers, very functional with a steampunk like vibe.
If you have access to a IR thermometer it would be interesting to see the temperature gradient on the heat-sink but you would probably have to measure on the fin side.
If you ever need to lower your tent ambient temperature a simple fix would be relocate the driver to the exterior of the tent. That will reduce about 20~25 Watts of heat.
My only suggestion (a minor one) is to tidy up the wiring a little. It might avoid a potential accident down-the-road.
