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Hmm, what do you mean by that? Seems reasonable from 12-18"?

I've been out of the game for a while but have been looking into lights for a 2x2 tent. Anyone using the Atreum Lighting HYDRA-1000? Link: https://www.amazon.com/dp/B08RHRPV1T/ Looks like a solid package and the diode spacing is really interesting, supposedly to reduce hot spots. I'm seeing...

Can you elaborate on why LM561Y are inferior chips? This is the first time I'm hearing of them.

I bought mine from that listing. Having talked to the company behind these boards, my understanding is that the diodes are connected 16 in parallel then 18 groups in series (rather than 18 in series then 16 groups in parallel) which makes it more fault-tolerant (i.e. if one diode goes out, it...

Might be a silly question, but have you checked that your voltage adjustment on your drivers isn't turned down? The forward voltages do seem low...

They will probably ship to the EU directly if you reach out to them. I’ve bought boards from Atreum Lighting (www.atreumlighting.com) and had good experiences. I know they ship internationally as well, they may be able to hook you up.

+1 on the driver specs for the Osram board I got 2 of the 800-diode boards as well, though a corner on my boards got slightly bent during shipping. They are pretty sweet boards with super even coverage. Going in a different direction though for my build, if anyone wants them, PM me.

Not to throw more fuel in the fire on this polarizing debate, but I got my boards from the OP's ebay link. They seem to perform great, no visible black dot on the diodes, and it fit my budget. They told me they are developing a heatsink for the boards as well. Just my 0.02

Interesting, though it's hard to make a direct comparison since each source is using slightly different test parameters. Having played around with my PAR meter, reflected light makes a significant difference, so I could believe that my measurements at 18" w/o reflector is comparable to the LED...

Ok, finally got a chance to take PAR measurements. These were measured in an open area (i.e. no reflectors). Killawatt meter shows 150W at the wall. Units are umols/m2/s, in case it isn't obvious. Does anyone have a PAR map for a single HLG QB288? I looked around but haven't been able to find...

Yep, that's 1x "QB-288". I was surprised by how well it dissipates heat with no heatsink... well I suppose the driver housing is sort of acting as a heatsink. Still can't believe how bright these boards are.

Finally got my drivers in and connected up these ebay QB boards. The board and driver are attached to a 9"x12" aluminum plate. My Killawatt meter shows 153W, and the max temp is about 50C with no airflow. Pretty sweet! No PAR measurements yet as it's getting late...maybe tomorrow.

I received my 288-diode boards on Tuesday, they shipped really quick. I haven’t had a chance to play with them yet since V-day took precedence ;) Hopefully I’ll get to it tonight.

PAR meter, quantum sensor. Potato, potahto =)

I think your math checks out. 7 strips @ 46V in series is 322V 1.12A * 322V is 360W It's all within the capability of the driver you selected. If you're going with 7 strips per driver, and 6 drivers...you may as well get 42 strips. As for temperature, you can always power them on and put a...

Long thread, but a great read. Learned a lot from you guys. Has anyone tried these ebay QB288's? ebay com/itm/192434587761 I'm thinking of ordering a pair to test out, but I'm not sure if the risk is worth the cost savings. Edit: Gonna take the chance. I have a quantum sensor coming too, I'll...