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Advanced Discussion
Lighting/Enclosures
Why UVI is used, and not UV Flux
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[QUOTE="Claudiusx, post: 1897596, member: 31715"] I thought I would take the time to discuss to anyone curious as to why you would want to be measuring UVI (UV Index) as opposed to UV flux (mW uv cm2). If you don't care to read this all, and just want the meat and potatoes, click here: [url=https://www.beardeddragon.org/forums/viewtopic.php?f=34&t=250316#p1897597]Short and sweet version[/url] Firstly, what is UVI? UVI is simply a standard measurement of sunburn and D3 producing Ultraviolet light. But doesn't all UV cause sunburn and D3 synthesis? The answer is no. Not even all wavelengths of UVB light do that. This is why it's important to focus on UVI, and not uv flux in our situation. The wavelengths that are largely contributed to sunburn and d3 synthesis are mainly in the shorter wavelengths. When you are measuring UV flux, you are measuring a wide range of wavelengths, including those outside of the range of concern for us. This can lead to issues of assuming you have enough UV, but not, or visa versa, assuming you have enough, but providing dangerous amounts! Luckily for us, we have the Solarmeters. The solarmeter 6.5 measures UVI directly, the best choice if you had to chose. The Solarmeter 6.2 measures Uv Flux. The problem with the Solarmeter 6.2, is that it doesn't differentiate between the short wavelengths and the longer wavelengths. It is only the short wavelengths that largely contribute to D3 synthesis, and the sunburning effect. In essence, you can have a uv flux reading of over 400, and still not be providing the rays your dragon needs for proper D3 production. Additionally, you can have a UV flux of only 50, and be providing way too much! Here is an example from Dr. Baines on this exact scenario: So in conclusion, if you don't have a solarmeter 6.5, (which is totally not a necessity mind you) then your best bet is to follow manufacture instructions for your bulb. Or, find a reliable site online such as [url]http://www.uvguide.co.uk/[/url] which is Dr Baines site which gives you the UVI levels for your bulb at certain distances. If you are using Arcadia bulbs (which is highly recommended) you can find this information on their site here: [url]https://www.arcadiareptile.com/lighting/full-sun-baskers/[/url] -Brandon [/QUOTE]
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Lighting/Enclosures
Why UVI is used, and not UV Flux
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