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Constant brightness in DC for bulbs require 4 silicon diodes to set up a 1.5 volt drop across the motor circuit. That's it, 4- 5 cent 1n4001 diodes and a 1.5 volt lamp. In dcc all one needs is a 12v bulb. As to brightness, LEDs might put out more lumes per watt, but for ultimate brightness (if that is what you are after) small 12v halogens outshine all. Remember though, if the light is too bright it shines through even painted plastic. You can get them and white leds from www.allelectronics.com/ along with lots of other parts like low rpm ac motors. I think all current white LEDs are t-1 3/4 which are kind of big for N, but you could notch your frame. But to use an LED you also need include a full wave bridge for polarity control and a dropper resistor. That's a lot to pack in an n. And what's a facer?
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