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Yes efficiency of these drivers relates to the voltage. So as nogod said, if you have a high voltage and the driver is dimmed way down, you still get high driver efficiency.

Yes it is rated to out put 8.9A, divided by 9 COBs that would be 989mA per COB. But in practice it will put out up to 9.7A or 1080mA per COB when adjusted to max. The driver would probably pull 367 watts total at almost 95% driver efficiency. As far as pros and cons, using the HLG-185 series...

No worries either way, the Mean Wells have a good resale value. You can probably ship an HLG-185 in a flat rate padded envelope for $5.75.

I agree, would be interesting to see how the plastic holds up after a few years of bombarding. The blue photons are good at causing instability, very good at bleaching etc so may be able to affect the plastic.

If you used HLG-320H-36A, you could run 9 CXB3590s in parallel and get about 1080mA to each COB. If you prefer series, the HLG-185-C1050A can run 5 on each driver and put out up 1150mA

I noticed the Kingbrite is heavier and thicker than the Ledil, 14.6 grams vs 10.7 grams. I recall in earlier DIY reflector testing that 2 layers of heat paint noticeably improved the reflector performance versus 1 layer. But when I added a third layer it made no difference, and was still...

Very interesting to see significant gains from the Ledil reflector adapter itself: Bare Vero29 versus Vero29 with @SupraSPL[/USER] I wonder about painting the outside of the reflector, to minimize the translucency/passthrough. I havent seen the KB's yet, but always wondered about ledils. PAR...

Yes it is a close call and I think deserves more testing. Ledil Kingbrite Unfortunately the Kingbrite reflector that I have on hand has been painted and unpainted, probably losing some of its mojo due to that treatment. I need to get a brand new one to re-test. However, I am curious how the...

If you are going to run CXB3070s hard, might be better off with Vero29s, but if you are going to run medium or soft because you need the very highest efficiency, the CXB3590s are the best at doing that job.

If you can find them at clearance prices they are OK

Yes if you know the heatsink temp, dissipation power, efficiency and thermal resistance of the TIM and COB, you should be able to estimate Tc and Tj. We can try to verify it by monitoring the hot and cold Vf while keeping the current steady. We can also try to measure temp droop to further...

I have always ruled out the 4.6" for passive cooling, because of the relatively close fin spacing, taller fins and thinner base. Horizontal orientation exacerbates those issues. So it would take a higher heatsink temp to get the air convecting out from in between those fins and it would be less...

Yes Bridgelux has increased the specs for their low current figures and their lumen output several times recently, along with a price drop that is a big win for growers. I believe Kingbrite will or has reduced their Vero29 pricing as well.

Yep 3.9 might be a deal breaker. For example, if the HLG-185H-C1400 can only put out 900-1000mA for 4 Vero29s in series, it is putting out less current than the HLG-185H-C1050 would AND the HLG-185H-C1050 can run 5 Vero29s. One solution could be to use the HLG-185H-36A and run the 4 Veros in...

Yes these graphs are based on photon count so technically the color difference is already taken into account for the most part (assuming the correction factors that I used for the Apogee SQ-120 were close). You are correct about the 27W, that matches the power use of the COBs and was monitored...

Yes the 120cm²/ heat W figure is based on the passive friendly profiles with fins, horizontally oriented, a low thermal rise and assuming some air movement in the space. If the heatsinks were shaped more efficiently (radial style is a good example) then you could reduce that number. You could...

I was the heatsink temp in this case. The Taylor thermometer is precise and accurate, but when measuring in between the fins the probe interferes with the airflow slightly, so I had to prewarm the thermometer probe until it was very close to the temp I was trying to measure and then get the...

What top bin CREEs have have always done best is reach the very highest levels of efficiency at low to mid power, Hawaii, LA, NYC, desert, solar powered, battery powered applications etc. I think these test results reinforce that but even at 75W the CXB3590 is putting out significantly more than...

Thank you @robincnn and @Greengenes707 for hooking me up with a variety of reflectors and adapters to experiment with. Not sure this is the right place to post this but this thread is probably more up to date than mine. This reflector test was done with a Vero29, pulsed at 20W. The measurements...

Good question, I am not sure how much difference there would be in practice. On paper it is not a large difference. At 79W the Vero29 4k V1 is supposed to be 125lm/W and the 4K V2 is now up to 135lm/W, an increase of 8%. Happy New Year to you as well hope you are getting some nice buds!