Was this the first LED test light?
15:26
fixing a faulty light with powerful built in fan (awesome chip inside)
29:34
Induction light - what's inside, schematic, experiments
12:25
EEVblog 1622 - The BIG BEGINNER MISTAKE with Multimeters
35:36
The First Light Emitting Diodes
25:55
Fixing a dead LED street light lamp. (SOX retrofit.)
21:34
Fluorescent lamps, electronic vs. glow starters
12:47
Scary 1920's high voltage thing (LOUD ELECTRICAL NOISES)
30:13