I agree with Gordon, for an outside box you don't need a uv bulb. During the summer mine don't have any extra heat or uv, just cold frames for cooler days.
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Suze. 
3 THB, Sammy, Jemima, & Phoebe
7 Marginated, Tabitha, Ptolome, Tatiana, Noah,Lottey, Lulu & Poppy
1 TGG (Emma) RIP Feb 2012
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