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I use micro-mini LEDs, 1.6mm 20mA, either multiple in series or with resistor and haven't come across any excessive heat problems. If you're concerned about the heat leave a 1/8", or so, air gap between the resistor and surrounding items. On my test bench I ran one LED with a resistor at 17 volts AC for a week. I had a 1/8" air gap against 20# copy paper, the room temp was set at 76°. Although not enclosed as it would be in a passenger car or structure, the test area had no extra ventalation and I had no problems with heat build-up. The second test was with multiple LEDs in series, same result - no problems. In the past I have used LED/resistor combinations in other structure (buildings) models without any problems.
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