Lava Lite 40 Watt Replacement Bulbs for 16.3-Inch Lava Lamps, 4-Pack 4 Bulbs Replacement Bulb for Lava Lite Lava Lamps Use for 16.3", 32 oz and 52 oz Lamps 40 Watt bulbs Original Lava brand product as pictured; not generic from a hardware store