Floor Reading Light How Do You Know Which Switch Will Turn On Each Light Bulb?(read The Details) [RIDDLE]?

How do you know which switch will turn on each light bulb?(read the details) [RIDDLE]? - floor reading light

It is a building on 2 floors. There are 3 bulbs on the second floor and 3 switches in the first. U need to find out who is running bulb.But at all light or you can upload only once.