@CaveScientist Efficiency with LEDs is kept higher by making sure that the voltage supply provides only just enough headroom to allow current control to work. (Voltage control of brightness is much trickier.) So the voltage supply should be a switched supply and should vary with dimming needs leaving the current control only just enough headroom to do its work. I know this because power dissipation in large roadside daylight visible animated LED displays dissipate many 100's of kW. Some use the technique to keep dissipation more livable, where messing with color calibration is less important.
↧