My point was I cannot fathom why someone would choose a 36v driver over the 42v diver for that particular CoB.
What is the purpose? Is it to use the Vf to regulate the current? How can that be done? In this case it's
E = I x R not I = E÷R
Do understand that while LEDs are semiconductors they are not manufactured with precision lithography like transistor logic semiconductors (TTL) or analog devices like op-amps etc. LEDs manufactured on the same wafer can have significant differences in Vf. The are getting much better with Vf consistency with all the R&D going into lowering the Vf of GaInN LEDs. Ever notice why the Gen 2 EB series strips have an improved lm/W? When you have 112 LEDs being powered, a small decrease in Vf makes for a significant improvement.
Point is, Vf should not be used to regulate driver current current. And the driver's max voltage should not be used either. The min and max Vf should BOTH fit into the driver's constant current range.
I have no problem saying I am wrong when I am wrong. I have apologized for being wrong on this site a few times. I said it to
@alesh regarding the math.xls.
And
@Randomblame
Maybe if you and your dip shit buddy
@wietefras would back up why you say I'm wrong I could then help you pin point what you do not understand and correct errors of your ways. I does no good to just say I am wrong. You need to explain WHY I am wrong.