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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...