The Zilla Mini Halogen Bulb is a compact heat and light source designed for reptile terrariums and other small habitats. Its halogen construction provides stronger, more efficient output than traditional incandescent bulbs while fitting into tight fixture spaces. The bulb screws into compatible mini halogen fixtures, including the Zilla Halogen Mini Dome, Zilla Pro Sol Fixtures and Zilla Low Profile Fixtures. It is offered in multiple wattages and light tones to suit different reptile lighting needs, from bright daytime illumination to dimmer tones for nighttime viewing. No assembly is required beyond installing the bulb into a compatible fixture. Replacement should occur once output diminishes or the bulb reaches the end of its rated life.