The Exo Terra UVB 100 Tropical 13W is a specialized compact fluorescent lamp designed to provide essential UVB radiation for tropical reptiles and amphibians kept in terrariums. This energy-efficient 13-watt bulb mimics natural sunlight to support proper calcium metabolism and overall health. Key features: • 13-watt compact fluorescent UVB bulb • Specifically designed for tropical species • Provides essential UVB radiation • Standard E27 screw base fitting • Energy efficient spiral design • Helps prevent metabolic bone disease • Promotes natural behaviors and breeding The Exo Terra UVB 100 Tropical bulb is optimized for use in tropical terrariums where species require moderate UVB exposure. The spiral design helps maximize the light output while maintaining compact dimensions. For optimal effectiveness, the bulb should be replaced every 6-12 months as UVB output gradually decreases over time, even if the bulb continues to emit visible light. Always mount at appropriate distance from animals as recommended for specific species.