I used it once in my kingsnake's tank. I had an extra fixture and bulb from my lizard. I did not notice a change in behavior, so I removed it.
If you want to use it, the UV rays are only as efficient as the heat that must accompanied it so it can be absorbed properly. So without it being exposed to heat at the same time as the UVB, it is kind of pointless if you intent to make it beneficial to your snake. Hence, UVB works best for those that basks, like basking lizards and maybe some snakes that basks. Like Deb said, the expense for the equipment is not worth it. Today, 2 of my basking bulbs went out. 2 weeks ago, another one went out after I just bought it. These bulbs cost about $7-8 each and basking bulbs are almost guaranteed to fail every 4-6 months, especially for the 75watts and 100watts. The fluorescent fixture is expensive, costs about $70-80 for the T5 ZooMed fixture, a little less for a T8. Bulbs costs about $15-20 each which must be replaced every 6-8 months. It is an expensive nuisance.
Lastly, nothing beats the sun. The UV equipment, no matter how sophisticated, will never do the same job as the sun.
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