These are in my Uncle's shop where he does Corian and granite countertops. I had two cameras and a tripod and was sitting at my desk (we had our business there too at the time) and happened to think about doing this, so I did. this shows the main work area lights starting, warming up, being on and turning off. I also slowed the footage down at the end to show the start-up and switch-off at the end!

For some reason there seems to be what looks like a mercury vapor lamp in the rear one.

Enjoy!
© 2013 mrboojay