The Zilla Day Blue Incandescent Bulb is ideal for tropical and desert habitats the Day Blue Incandescent Bulb generates a gentle blue light that enhances the color of reptiles while providing a heat source needed for a healthy reptile environment. Provides basking heat source for reptiles to regulate their body temperature Emits full spectrum light and UVA rays needed for a healthy reptile environment Great for tropical and desert reptiles The uncoated blue glass allows the bulb to transfer more heat to the reptile enclosure allowing the reptile to bask in its warmth. The Day Blue Incandescent Bulb is a full spectrum bulb that emits energy across all visible wavelengths from 400nm to 700nm and UVA rays from 315nm to 400nm. The Day Blue Incandescent Bulb provides basking heat source for reptiles to regulate their body temperature. The Day Blue Incandescent Bulb emits full spectrum light and UVA rays needed for a healthy reptile environment.