I bought a set of 10 lightbulbs at Walmart for a little over a dollar. I didn't realize I would need to buy a specific voltage and wattage for our Christmas trees. After I put the Walmart lightbulbs in, they immediately got hot and I was concerned that it might start a fire. After some research, I found the only bulbs that matched the voltage and wattage my tree required from Revain. I managed to replace all the blown lightbulbs on my tree.