‎2.95 Inches

Make sure this fits by entering your model number. ✔ The 75W infrared heat lamp is made of solid ceramics element, it has a perfect heat radiation feature and no light emitted, not disturb reptile's normal sleep schedule (day or night), great for pet, lizard, coop, chicken, turtle, snake, chameleon, bearded dragon ✔ This ceramic heat lamp is simple and easy to install, just screw it into a standard porcelain E27 screw socket (ATTENTION: Use only with a porcelain socket, because the plastic socket may melt the lamp holder)