The lights

Logic Level 1

You are in the attic of an old house.

There are 3 switches in the attic and 3 lights in the basement that connect to the switches.

You don't know which light connects to which switch.

What's the minimum number of trips you have to take to figure it out?

Note: Lights retain some heat after they're turned off.

Image Credit: Flickr kaitlin.

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