This condensation test is done on every watch that is subjected to high pressure wet testing, where the watch is tested for more than the 10 bar that the dry testing machine is capable of. My wet testing machine is capable of testing to 125 bar, or 1250 meters depth.
You only need to place a drop of water on the crystal, so no harm should come to a watch from doing this.
I would not recommend a TV (magnetic field issues) but a lamp would be fine. I use a warming plate specifically designed for this test - it warms the watch to 47 degrees C. You don't want to make the watch too hot though...
Cheers, Al
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