I totally agree I measure the temps with a digital thermometer w/probe and temp gun. I don't use dimmers or anything. The bulbs are 45 or 50 watt halogen indoor/outdoor floods. They make the basking spot 135-140 while keeping the cool end around 80. They make a lot of heat within the light's beam, but don't raise ambient temps too high. They can be used in smaller enclosures as well.

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