Light emmiting diodes LEDs put out basically no heat. They are the only sensibkle solution other than trying to restore the old system. There was someone in the last week on site that explained how he did it with leds. The problem with leds has been the light does not diffuse well. On the otherhand there are many improved variations hitting the market perhaps. One gentleman had his leds burn out. That was because his bias resistor was too low in value. Get the bias resistor right and you will probably burn out before the Leds do. With leds the rehostat or dash dimmer control may not be quite as effective as you are dealing with so small a current. I wish someone who has switched over to leds would comment. I think I will try them myself.