You are in a room with a closed door leading into another room where these ten bulbs are. You can control the ten light bulbs from the room you are currently in. You have to be able to tell which bulb corresponds with which dial.
Yes, dial. Fortunately for you, each Super-Self-Cooling lightbulb isn't a simple on-off switch. It's a dial, with settings from 0 to 4 to level the brightness. Yep, 5 levels of brightness... since there are ten bulbs, it should be easy, right? Wrong. Not that it would be easy anyway, with 5 settings for 10 bulbs, but there's more: The circuitry is screwed up. One of the dials is useless, and another dial controls its own light bulb as well as the light bulb that used to correspond with the useless dial- so one dial controls nothing and another dial controls two light bulbs at once. There are two cases like that! Two useless dials, two doubled-up dials. There is no way to figure out beforehand which dials are useless or not, all the rewiring problems are above the other room.
Since your job is to figure out how each of the 8 working dials with 5 setting levels affect the 10 bulbs, what do you do?