>        Just put a fixed load (resistor) at the LM317 output and it will
> heat enough. Couple the resistor to the LM317 body for more heat.

That brings it's own problems of additional heat and power, and
dosen't address starting the thing up when it's already cold.

Note that these motor-driven revolving lights do not require regulated voltage.
That's why I suggested batteries to drive them. They aren't on all
that long when in use anyway.
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