ReptiSun 12″ 5.0 UVB Fluorescent Reptile Lamp. Why choose the ReptiSun 12″ 5.0 UVB Fluorescent Reptile Lamp?. Ensure your reptiles thrive in their habitat with the ReptiSun 12″ 5.0 UVB lamp. Its superior UVB output and bright light support their active lifestyles and overall health.