Massive ebay COB LED Grow light test
I bought a ’12V 70W 7,000LM LED Panel Strip COB Light Lamp’ from Ebay and tested to see if it suitable as a grow light. It’s well made. The aluminium board is thick and solid and all 336 of the LED’s are well matched so it is likely to be reliable to run at the correct load.
The data sheet says 12V DC and 70 watts but at 12V it draws over 4 Amps and runs very hot. At 11.5V DC and 2.5 Amps it runs pretty cool. We tested it at this wattage (33.5 watts including the LED driver). The light outputs 44 PPFD at 9 cm from the 太陽傘 over 2ft x 2ft or 60cm x 60cm. The PPFD per watt is 1.42.
You would need at least 4 to cover a 60cm x 60cm grow space.
Thats €40 for 4 + €10 postage = €50
The driver, wiring, plugs etc = €50
Total €100 for a 100W, 1.4 PPFD per Watt light. Not really worth it, better to buy a MARs reflector or equivalent.
However if you have a 12V power supply current limited to 2.5 Amps this will work perfectly. Thats what I am going to do with it and use it as a seedling lamp.