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Hi Chris,
I think you mean 13 watt compact fluorescent? It'll be roughly ~22% of the electricity used, or a 78% savings. The cost of buying them has come way down -- my local Aubuchon hardware sells some of them for 99 cents each -- and they take the old failed ones back, to recover the (tiny) bit of mercury in them.
Typically the CFL's last longer than incandescent, though they can't get too hot -- some fixtures that trap the heat will cause them to fail prematurely.
They come in different color temperatures: most people like the warm white best, though cool while or daylight are nice in some situations.
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