The white ones are actually 'blue' - but all that is not needed, the LEDs are current driven devices and even if they get a bit more relative output flux with higher currents, it's close to negligible. Overall phosphorus is 'bad' for the LEDs, reducing luminosity, increasing temperature.
Also the PWM can be in the high 30KHz w/o much of switching sacrifice loses, not even dogs would react on it.
Also the PWM can be in the high 30KHz w/o much of switching sacrifice loses, not even dogs would react on it.