Three Lights

Here's one for a certain sister.

I have three outdoor lights on the outside of my house that I never use. (As you know, I'm not much of an outdoor guy.) In fact, yesterday I realised that I don't even know where the switches are that turn them on and off.

I've had a hunt around, and in my basement I've found three switches that I'm reasonably sure are the ones in question. I seem to remember that each switch controls one and only one of the outdoor lights, and all of the lights are controlled by one of these switches. I've just replaced the bulbs in the outdoor lights, so if I find the right switch they should light up.

I can't see any of the lights from inside the basement. Now obviously I could walk up and down the stairs from the basement a bunch of times to check which switches go with which lights, but man those stairs are tiring, and I'm kind of lazy. I'm pretty sure that if I start from the basement there's a way of working out which switches are which with only one trip up the stairs. Am I wrong? How do I do it?