Big Apple 150 Watt Black Heat Infrared Ceramic Heat Emitters Thickest ceramic available, weighing up to 3 times more than other element brands Average of 50% more insulation than other element brands Provides up to 30% more heating surface than other element brands Delivers one of the most powerful downward thrusts of heat available from any heating source Lasts up to 5 years! - over 20 times longer than regular bulbs