I have been through 4 heat bulbs in less than a year and I am ready for a change. I've used the same bulb everytime and printed right on the box it says ''bulb wont seperate from base''. The first two bulbs did seperate from the base and re rendered useless. The third bulb burn out only about 60 hours into its life and today the 4th blew up.... thats right I said blew up. The light hangs about 3 feet off the ground and has a wire cage around it to prevent burnt duck heads. I looked at the camera that I have hooked up so I can check on them and I saw that the light wasnt on so I went to check it out. Their night box is 4x8 feet and there was glass from end to end. Luckily they both got scare and went outside and no glass was eaten. It took me about and hour to get out all the shavings and to make sure there was no glass left. So I am open to ideas for a different heat source as long as it doesnt send my electricity bill through the roof.