Is it more efficient to drive LEDs at a high current and low voltage, than a lower current and high voltage?
I'm in a situation where I have to design an LED driver for a custom CoB emitter, so can choose the voltage and current as long as it's 22W overall. My input voltage is likely to range from 7-24V. I'll also need the LEDs to be dimmable in some way or another, likely PWM.
I'm not sure whether I should ask for the emitter panel to be made a lower voltage with higher current, or the other way around. It seems after a lot of looking that a reasonably priced simple boost LED driver is hard to come by, but I'm worried that using high current will cause power losses to be greater in the PCB traces and other components with significant ESRs.
So which way is best and why? And while I'm at it, any part recommendations for a cheap-ish driver?