I have heard mixed feelings about the UV flourescents (fl.) versus the mercury vapor (MV). I am not 100% sure about all of this, but I will repeat what I have read. They say the fl. (5.0 UVB) only put out about 10% of what the sun does. The MV supposedly are almost 100% (may be off a little). I also heard the MV should only be on for around 4-5 hours due to high radiation, which would mean you would need a secondary basking/heat source. I try to stay in the grey zone and use a fl. UVB 8.0 (the desert versions). I figure if the 5.0 puts off 10%, the 8.0 puts off significantly more, and Vito basks about 5-6 hours every day, and I have had no problems. Fattening up by the day and growing like a weed. Hope this helps.
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-Bill
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