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[QUOTE="BadCon, post: 1198336, member: 17986"] Well, to get the complete picture of a bulb you need a UV Index meter. UVB meters measure anything from 280-320nm....as these wavelengths are all UVB. The problem is that the shorter the wavelength, the more energy it has, and its these high energy short wavelengths that cause eye and skin issues. So while a bulb may look acceptable using a UVB meter, it may actually be emitting far too much short wavelength UVB. To put it another way, 50 microwatts of 280nm UVB will simply be displayed as 50 microwatts on the UVB meter. In reality, a bulb emitting 50 microwatts of say, 300nm UVB, would be the superior bulb as this form of UVB is safer for the animal. Things get more complicated when you start talking about UVB in the sense of vitamin D3 production, but for the sake of clarity I'll leave that for another post. So why is a UV-I meter a good idea? Because the shorter the wavelength, the more its weighted during the UV Index calculation. So a bulb emitting 50 microwatts of 280nm UVB will have a significantly higher UVI then a bulb emitting 50 microwatts of 300nm UVB. The higher UV Index is an indicator of a troublesome bulb. Historically, Zilla bulbs have been known to have extremely (read dangerously) high UVI's. [/QUOTE]
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