Beneficial for Reptile Health --- Infrared heat penetrates skin scales and tissue, thereby promoting health and healing, widening blood vessels and increasing blood circulation. This will also increase the temperature of the ambient air in the terrarium. No Light Emitted - The lamp does not emit any visually detectable light that could disrupt your pets' sleep cycle. Working Principle - Solid ceramic element has good thermal radiation functionality, lasts up to 20,000 hours (also works in sealed box). Easy to replace and install --- This ceramic thermal bulb is simple and easy to install, just screw it into a standard porcelain E27 screw socket (ATTENTION: only use it with porcelain socket , because the plastic socket could melt the bulb holder). Wide Application --- This ceramic heat emitter is the ideal 24 hour heat source for reptiles and amphibians. Ideal for pets, chicken coop, lizard, turtle, birds, snake, chameleon, bearded dragon. Product description Color: 50w Specification: Condition: 100% brand new The black color Material: ceramic + alloy Size: (L) x (W) 7.5 x 10.5cm / 2.95 " x 4.13 " (approx) Power: 50W / 75W / 100W / 150W (optional) Voltage: 220V Heating source: ceramic, infrared, electric, no light emitted Package included: 1 x heat emitting bulb