Chewy had the BEST price as our move made me go through 2 in quick order. They are great and supply constant heat without light BUT, the slightest side force will break them at the threads. It's because they are ceramic. I had one last 12 years, then broke it. At least the lizard is happy.
it makes a ten gallon tank around a hundred degrees fahrenheit consistently. usually between 100 and 101 during the day