I use one now in my new iguanas cage. Its a very large enclosure, and it's not being used for it's uvb output, but just for added light without the heat a regular bulb would put off. I had it sitting around so I figured I'd make use of it. Not sure on their UVB output, but they do claim it, and that is what the bulbs intentions were. To provide the beneficial UVB without the need for a long fluorescent fixture, just a regular dome fixture can be used. Just too new of a bulb for me in my opinion to use it solely as a uvb source yet. ESU has put out some real crappy fluorescent bulbs in the past claiming higher UVB output, and they put out very little when tested. Need to see a few more tests run on them and actually see how far the uvb gets thrown from the bulb, and exactly how much it gives off before I would use them regularly. I saw one test, but the numbers of supposed UVB being output was oddly very high for any fluorescent, so I'm not sure in that particular test it was not mistaken for a mercury vapor bulb. I would say great for a safety net for a uvb source cause I'm not sure of the output at what distance, and adding light intensity without much heat.
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