What style lamps are you burning up?
Are they standard, pear shaped incandescents or are they spots or floods that are designed to reflect the light (and some of the heat) out of the can?
If they are standard incandescents such as you would find in a lamp, switch to the proper bulbs. If they are spots or floods, change to a lower wattage and make sure there is no insulation covering the back of the can.
