Zilla Mini Halogen White Day Bulb, 25 Watts 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 1,000 hours on average, double versus incandescent Provides healthy light and essential warmth for your reptile Fits with Zilla fixtures: Halogen Mini Dome, Heat & UVB Basking, Mini Heat & UVB and more!