Our neighbor put in a new fixture in the basement and like the rest of the bulbs in the house they are all short-lived. Compact florescent bulbs dies in 6 wks and the same with the new 50w halogens in the new fixture. Any idea what is causing this? I have tightened or checked the wires in the house for them (1/2 alum. And copper). When a load comes on (washer and ect.) the lights brown down a wee bit. Any help or advice would be welcome