This provides healthy light and essential warmth in the reptile habitat. Fits with Zilla fixtures: Halogen Mini Dome, Heat and UVB Basking, Mini Heat and UVB and more! 25 Watt Mini Halogen Bulb is equivalent to 50 to 75 watt incandescent bulbs Up to 250% more efficient than incandescent Thicker glass and stronger filament bulbs yield over 2,000 hours on average, double versus incandescent Provides healthy light and essential warmth for your reptile