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If its a MVB then you should be getting decent uv(b) about 12" from the lamp and it decreases drastically after that. The benefits of MVB over UVB bulbs mainly are distance of initial penetration and lifespan. MvB bulbs normally get 12" of penetration and last about a year. UVB bulbs normally get 6" pentration and last about 6 months.
I would personally be happy with the 80 degree cool end.
Humidity at 75% isn't bad. I'd rather have a flowing humidity rather and a stagnant one anyway.
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