‎2.95 inches

✔ Perfect 24 Hours Heat Sources – Ceramic heat emitter is a radiant heat source which creates a natural sunlike heat with a uniform pattern, last up to 10000 hours. ✔ 100% Heat Efficiency – Reptile heat lamp the long wave infrared heat produced by this emitter will warm reptiles very efficiently. It also increases the ambient air temperature in the terrarium. ✔ No Light Emitted – Reptile heat bulb does not disturb normal sleeping habits of reptiles, chickens coops and outside pets. Available for daily use.