Stemclas R39 E17 30Watt Reflector Type Replacement Bulbs for Liquid Motion/Glitter Lamp (2 Pack)
Lochimu 30 Watt Lava Lamp Bulb Reflector Type Bulb R39 E14 Base Lava Lamp Bulb High Temperature Lava Lamp Replacement Bulb 220-240V - Walmart.com
30 W Lava Lamp Bulbs Reflector Type Bulbs R39 E14 Base Light Bulb High Temp Resistant
UPDATE: New bulb seems to have done wonders. It seems to be quite content with a 30 watt R39 bulb instead of the recommended S11 25 watt bulb. Though I think the