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It doesn't increase the photons it just redirects them, and some are lost because the glass isn't perfectly transparent. It also hampers cooling of the COB. Yes, they both (lense and reflectors) narrow the angle the light projects. But COBs project more downward than HPS bulbs ( 180 degrees vs...

If you hit the COB with water while spraying your plants it might be bad. The lense offers protection. I don't plan on using any unless I get a lot of spill. You can keep the COBs closer to the plants than HPS. I think a lense might filter out some photons unless you got really high quality...

The driver continues to put out the same amps, but, after one of the COBs burn out the current that used to go to the one that burned out is now added to the remaining COBs. This puts them in an over current status (think heating element) and eventually another COB will fail, sending it's...

Thanks Realstyles, I got my COBs from Jerry and thought it would be easier to get the holders in th USA. NOT!!! Lots of suppliers have holders for CXAs. Oh well. Thanks again.

Where can I get COB holders for CXB 3590s? I tried a bunch of electronics places but no gots.

Very nice! Professional looking. Check out Growmou5 video on Youtube. He has very similar design and nice tutorial.

I love your tutorials!!! Just bought a Meanwell 240H and 5 COBs. Thanks so much! I like getting the theory instead of just cookie cutter build so I can customize for my space. I have used HPS in the past but want to grow without all the heat. Next I'm gonna try coco medium instead of soil.

You are running the same wattage driver so you probably still need a fan. I went with 5 COBs at 1400mA and got a 4' chunk of heatsink so I could skip the fan.

3' long?

What heatsink did you get?