Actually it is usually poor contact w/ the bulb. The metal tab at the
bottom of the socket tends to flatten out & separate slightly from the
bulb which causes arcing between the contact & the bulb. Bend the tab
upward (unit unplugged of course)& clean the contact tab if necessary
& the cheapest bulbs you can find will work just fine.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.