Product Overview Pack of 2 Bulbs for 16.3″ and 17″ Lava Lamps These Memotronics brand bulbs were made specially to work with the 16.3″ and 17″ Lava lamps by incorporating a long-life filament into the bulb. These 40 Watt bulbs are for use with the 16.3″ and 17″ lamps. Please note that other model Lava lamps may use a different bulb that has a different screw-in bulb socket. Our bulbs have the correct 26mm screw base (approx. 1″ diameter at the screw). The glass globe has a 1.9″ diameter and the overall length of the entire bulb is 3.4 inches. Reviews (No reviews yet) Write a Review