I was wondering about these mercury bulbs and what difference they make in a tank. As of this moment, I have:



1: A 60 gal., front-sliding aquarium...

2: One UVa/UVb flourescent bulb running the length of his tank...

3: One 100wt. Halogen heat bulb on the left side of his tank...

4: One Micro De-humidifier on the right-side bottom of his tank...

5: A concrete "skull" for basking...

6: An outdoor/indoor thermometer close to the basking light at the bottom.



At this moment his MAXIMUM temps are 65 ~ 70 deg. at night, 86 ~ 90 deg. during the day. As a result of this, Draconis tends to be sluggish at times and does not eat regularly, if at all. But when I have a 150wt. bulb in there, Draconis won't bask because the temps get to over 115 ~ 120 deg., and he hides all day long. What exactly are mercury vapour bulbs, and what should be a proper basking lamp, whether Halogen or non-Halogen, be? I know I need his temps between 100~110 deg., so is it possible the Halogen bulb is making his concrete skull (light-tan colored) too hot? I will admit that skull can get warm...
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Dl

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