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This is a normal post
en.wikipedia.org/wiki/Test_light - if he's gonna go that far to detect voltage via body capacitance he may as well go the whole hog and build a solid state theremin to make freaky noises with: en.wikipedia.org/wiki/Theremin#Operating_principles
(, Fri 13 Apr 2018, 23:25, Reply)
This is a normal post That's them.
I'd always though they were crude things with filament bulbs in them. Now I see they're crude things with fluorescent bulbs in them.
(, Sat 14 Apr 2018, 1:42, Reply)
This is a normal post It's a neon bulb which is a gas discharge lamp
Fluorescent lamps generate the final light with a phosphor that converts one wavelength into another.
(apologies for the pedantry!)
(, Sat 14 Apr 2018, 7:18, Reply)