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So it's 3 years later, any conclusions on which conformal coating is best? HLG mentions in podcast that silicone is not the way to go: 01:03:00 He doesn't mention which alternatives he says is better and only reduce efficiency by 1/10 of 1%? He only says silicone yellows and produces mold...

I heard 'Gas Face' is the fire!

The science definitely supports the opposite. Terpenes and cannabinoids are higher with LED over HPS.

Yes, I get that, but what's the catch? Less heat due to less voltage required by each diode? Say for whites, the high bin diode is 2.6-2.65v on the low side, and low bin voltage is 2.8v on the high side. So for a qb648 which has 36 circuits of 18 white diodes (648 18x2.6v is 46.8 vs 18x2.75v...

Something worth looking into is cocoforcannabis' test of 2 x 300w light bars side by side, in array. The coverage is superior to any 6 bar light.

Right on, I will have to follow that!

Do they get hot when you have them at 340watts or full blast? I can't believe they moved to a 0.09 inch heat sink in their newer design with the reflectors... those you have are right around 0.197inches.

Damn, looking good! Can I ask your opinion on the 2 HLG350, do you wish you had a 6 or 8 bar style light?

I still don't understand how they get away with a 2.3mm flat plate heat sink for that light... The HLG350Diablo that is ? Any ideas?

That HLG Greenhouse is 1.5m or 59in long. Would probably work really good in arrays over 59in x 59in trays, hung high. Also, I think there are some strains, vegetables etc. which are bred to take to that spectrum more.

Good info! Thanks!

Ok, so what you are saying is that there is little or no point in trying to run them above 5600mA - 56V which would be 333w total? Or are you saying that boards at max 320w or 5.72 max with 94% driver for total of 340w. If HLG are running them at this range with a 2.22mm heat sink, then it can...

Alright, I can live with pushing them at 5.6A x 56v. Which is 313W. Then the XLG-320 would probably do the job.

Also per samsung LED calculator, it seems that 1296 white diodes at 2.78V x 18(white) is only 50.4V and 3 reds per 18x6, would mean a total voltage of 56.55V if red is 2.05v: Acording to the calculator you can push 1296 diodes to 181mA before it goes to 'warning zone' for thermals. This is...

If my math is correct, then at 65mA each board has 36 x 65mA which is 2340mA. HLG states that reds are 6x the current of white so at 65mA then reds are 390mA. So 2 x qb648 should be 2340(2) + 390(2) = 5460mA for test current of whites. I'm not sure how they can claim whites are run at only 54mA...

Thanks! Very interesting video. But how does HLG get away with a 0.09 inch heatsink running two of them at 340w? What would you say would be the best performance benchmark? Still 340w or maybe somewhere between 340-400w? Without air cooling and using a slightly modified slate-type heat sink?

Thanks for a good answer! I also see that these qb648 boards are rated at 5000mA maximum. At 56v that is 280w, at 58v it is 290. Meaning two could be powered by a HLG-480-54-A/AB? If so, what type of heat sinking do you think would be necessary? I mean getting 380w out of a 320w driver is...

Hi, sorry for the resurrection, but I'm currently needing answers relating to this thread. I'm looking to run 2 x qb648's in parallel and trying to find the best driver. Seems HLG are using: The EUM-320S500MT Does this mean that they are using series at 112Vdc x 2.1A? This would mean that...