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u r right but u can put them closer than hps lamps, or? Lightburning is a fragile subject, i know.

There are companies which are more than 5 years on Alibaba and have good apprisal. Me myself have never bought led lights on Alibaba. So i dont have any experience though. But on the otherside, i cant believe that these companies could afford bad products or service.

You can buy directliy by different manufacturers on Alibaba, and you can save up to 50%. I recommend 2x QB with 320W for a 4x4 tent. @Yodaweed dont forget the heat factor. You can bring LED lights closer to the canopy compared to HPS lights ;)

Hi CobKits. Thanks for your reply. Yes you are right, since there are some faults in his measurement method, i am also investigating deeper into the specs of different led lights. What i have found so far is that the Quantum Boards V2 (with lm301b) are the most value per money and watt and even...

He tested over 27 lights. The CFLs is just for comparison/reference. The video is was really interesting for me.