So I came across this factoid and thought I would share and extrapolate. Based doubling the time in the attached graphic it costs about ten dollars per year to run a lava lamp daily. So that's something you can share with whoever may be concerned about wasted energy.
Here's the information from the GE Reveal bulb.
Lighting Facts Per Bulb
Brightness
320 lumens
Estimated Yearly Energy Cost $4.82
Based on 3 hrs/day, 11¢/kWh
Cost depends on rates and use
Life
Based on 3 hrs/day
Light Appearance
Warm
2650 K
Energy Used
1.4 years
Cool
40 watts
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So I decided to run the figures for me in the UK
4 x astro lamps, on roughly 10 hrs a day
(note the first number is missing from electricity price, it's 14.5619
Works out to £84 a year, or roughly $117.
£21/year for an astro (running 10 hours a day)
Quite depressing really!
I need some solar panels...
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