>>>Nope. Actually this one is much simpler than yours was if you think about it...
>>I think I got it.
>>Turn one switch on and leave it on, long enough for the light bulb to heat up.
>>Turn off that light, and turn on another just before you enter the room.
>
>You didn't indicate which kind of light it was, therefore the solution is invalid. It could have been an LED.

Actually, they were black lights.