You could always use a small fluorescent light ... they don't usually give off much heat. Or another option would be to move the low wattage incandescent bulb farther away from the enclosure so that it still gets light but not as much heat. I generally use fluorescent unless a hot spot is necessary.
Dyesub Dave. 
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1.2.7 Crested Geckos, 0.0.2 Micro Geckos, 1.1.2 White-Line Geckos, 2.2.0 Velvet Banded Geckos, 0.1.3 Gold Dust Day Geckos and one AWESOME boy that loves them all !!!
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