Incandescent bulbs aren't going away entirely, just the inefficient ones. Unfortunately, the inefficiency is something we homebrewers rely on; we want that heat energy that in most lighting applications is wasted. With the newer incandescents, you'll likely need to up the wattage. You don't need much to begin with, though; I use 40-W bulbs now.
Alternate suggestion: replace all the incandescents in your parents' house with CFLs or LEDs, save them money on their energy bill, you look like a good kid, and you get a lifetime supply of fermentation chamber heating elements. :-)