I don't know anything about tegus, but I've been looking at a lot of UVB bulbs. Arcadia is by far the best, but they're a tad more expensive. Cheapest I can find are on Pangea's website. Reptisun and Repti-glo are the next tier down, but if you can a hold of Arcadia, they last for a year or more UVB-wise. The other ones you have to replace after 6 months because the bulbs atrophy and lose the UVB percentage faster.
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