Quote Originally Posted by WakingNomad View Post
What's your theory on how she's making the first lamp bright?

What's your theory on how she makes the first lamp dimmer?

What's your theory on how she turns the second one on?

What's your theory on how she turns the second one off?
I looked on that video more carefully. This was not the wrong light sensor... those were bad arc discharge lamps.

It was not her making. It was automatic. Why do you think the lamp was off first? It was cooling down. When it was cooled enough starter managed to make sustainable discharge. Then lamp went brighter and brighter because it was ramping to the working temperature. As lamps go to the working temperature discharge is generally going brighter. But that lamp was probably broken and it overheated and went dark again. If that video was longer then we would see cycle of switch on, brightening and again shutting down.

For the second lamp it would be the same.