I was about to throw away my 20 year old fiberglass tree that wasn't glowing. Found out it was most likely a lightbulb. I unscrewed the box at the base of the tree. I removed the lightbulb which was no longer good. I ordered a bulb and replaced it. Now my tree is working again. I also found a bulb at my Lowes store before my order arrived so I now have a spare bulb for my tree. Be sure to use the exact same wattage bulb that your tree requires. Very happy to have my fiberglass tree working again for the price of a replacement bulb.