Here's a tip if you don't want to be spending money on bulbs every 1-3 months:
Buy a 100 or 150 watt bulb and hook it up to dimmer. Use a temp gun to dial in the proper heat 88-90. Went done right your dimmer will be turned down to roughly 50-60% power.
This keeps your bulb filiament from getting too hot and burning out.
What about using a bulb that's higher wattage than the lamp's output? I would think it wouldn't be an issue (lamp with low max wattage wouldn't affect higher wattage bulb?) but I don't know too much about the mechanics of electronics.