Zilla Reptile Terrarium Heat Lamps Mini Halogen Bulb 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 essential warmth for your reptile with a less disruptive nighttime glow Fits with Zilla fixtures: Halogen Mini Dome, Heat & UVB Basking, Mini Heat & UVB and more!