Bulbs are more of an irritant for the snake as they are nocturnal AND they will kill the humidity causing bad sheds. I strongly suggest a UTH with a thermostat instead since the cons of "lights" are a lot more and the pros. How are you measuring temps? Bulbs also get very hot, and analog temp guages are not accurate.
I have a digital temp gauge but another one is on the list. I would love to get a UTH and be rid of the bulb. I am looking at another stand as I can't use the UTH with table its on now. It is literally a table. Thanks for the info.