I’m in process of replacing my cobs with qbs and I’d like to reuse my driver’s.
I have HLG-120H-C1400a drivers.
I use these drivers in tents that are 2x2 foot.
I’d like to use 2 qb 120s in series on my driver. They will be 22 inches across which is cutting it close but should be very even coverage.
I’ll only drive them at 100-120 watts.
So now my issue… The vf on the 120s is only 24 volts.
The constant current region of my driver is 54-108v.
So I would be about 6 volts short of the minimum because 2 boards in series will be a voltage drop of only 48.
I emailed hlg and they said my driver will work, but didn’t give an explanation why… I tried to all but they didn’t clarify much.
I’m thinking if I add a 5 ohm resistor in series that will drop the voltage another 7 volts and I’ll be in range and I could then use my old driver. However… That seems a little crazy.
Not sure how much heat a 5 ohm resistor will add at 1.4 amps…
Any ideas here?
I’d also be interested in strip builds but those seem to require constant voltage drivers, which I do not have. Thanks for reading!