I'll start by not believing the hype surrounding T8 or T5 UVB lamps. They are much more expensive and not as good. I bought the Zilla Desert 50 UVB because it's supposed to be better than the CFL lamp. When I used my photometer to check the UVB output it was weaker compared to this CFL. On the 12" output the UVB was 2.1. Move the fixture length right or left and the UVB output is 0.9-1.0. Not acceptable for 18" fixtures. When using these CFL lamp at the same 12" height, the UVB output was 2.4 right in the middle. right in the middle. Move to the side, it's a little bit higher and a little bit further and the UVB output was 3.4 I can't confirm the longevity of the lamp yet but for now it's excellent I hope this rating helps people and saves you some money at the same time.
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