How's this for a soppy idea that ties up three PIC threads

Electronicated retro
Light dimmer
WDT as temp sensor

I bought my niece a lava lamp for her birthday and have been
running it (to check for faults) before she gets it. I noticed that
at different times of day (as the ambient changes) or a window
or door is left open and a breeze goes across the lamp, the
blob size changes. Cooler = smaller. "Dial-A-Diameter" control ?
Use a PIC to do the temperature measuring of ambient/lamp
and control the AC to the bulb to raise/lower its heat output. Only
needs a few degrees, which shouldn't affect the brightness (PWM
a white LED to compensate ?)

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