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That is a very thorough study of UV bulbs. It was a lot to take in, but very informative.
The difference between the two is not much, but the reptisun bulb has provided more success for more chameleon and reptile keepers, and may replicate the uv output of the sun more accurately.
Dunno if you have seen this site, but it's a good link, and also explains the problem with compacts:
http://www.uvguide.co.uk/phototherapyphosphor.htm
Ive checked every store in my local area, even somewhat outside my local area, and Repti-Glo is the only one available. I'd have to order Repti-sun on-line and pay considerably more. Which I am willing to do if its worth it. But though I've had people suggest the ReptiSun is better (people whos opinions I value) I've not yet heard anyone explain WHY reptisun is considered so much better. I've not encountered any issues so far (over ten years now) with using ReptiGlo bulbs. My chams rarely if ever see real sun, so I do want to do whats best for them; I am willing to be convinced!
Howdy Sandra,
UVB is always a great topic . Lets talk about only the Reptisun 5.0 linear tube vs. the Repti-Glo 5.0 linear tube. They have similar total output uW/cm2 levels as measured by a Solarmeter. There is a particular spectral content that can be further broken into UVB1 and UVB2 within that total uW/cm2 output that gives the Reptisun the edge. The UVB1 content creates vitamin D3 while the UVB2 content destroys D3. Research describes relation of UVB1 and UVB2 and total output levels, calling it the "D3 Yield Index". Table 4 in the link shows this D3 index and that a new Reptisun 5.0 has an index of 493 vs. the Repti-Glo at 151. Even a 10 month-old Reptisun 5.0 still had a D3 yield index of 368. Although I wouldn't necessarily keep using a year-old tube for another year, at least you know it wasn't total trash at 6 months .
Table 4:
http://personal.inet.fi/private/testudo/Pages/Table 4.html
The entire article:
http://www.testudo.cc/
So why didn't your chameleon drop dead from only having a Repti-Glo 5.0? Well I guess you can assume that even at less than half the D3 index of a Reptisun, the amount delivered by the Repti-Glo is good enough to not show health problems in the typical chameleon application .