The LED display on my old Kenwood TM-731A has four incandescent lamps back-lighting the LCD display. Two of them are in series, along with a 10 ohm resistor, and driven with 10.5V (7.8V when the dimmer is on). I realize the resistor will need to be much larger based on the forward voltage drop & current spec of the LEDs, and that the "dimmer" may turn the LEDs completely off. Question is..what color LEDs will work the best? What is this about FLAT or DIFFUSED LEDs? I am assuming bright white or soft white, but maybe it's simply a matter of preference?