The original 40w lights were a sunk cost. Already exist, function just fine.
Not counting fuel costs, or time, spent $3.00 on bulbs.
Bulbs that now consume 12w vs. 80w. (total).
In my state, electric is about 12c kWh so... how long would you have to run 12w vs 80w to make up $3.00?
Difference = .068 kw = $0.008160 / hr
367 hours to make the difference. roughly 2 years or more of fridge use.
Not as bad as I thought.. but $1.50/year? the ROI is better if you skip eating out for lunch 1 day every 2-3 years.
Not counting fuel costs, or time, spent $3.00 on bulbs.
Bulbs that now consume 12w vs. 80w. (total).
In my state, electric is about 12c kWh so... how long would you have to run 12w vs 80w to make up $3.00?
Difference = .068 kw = $0.008160 / hr
367 hours to make the difference. roughly 2 years or more of fridge use.
Not as bad as I thought.. but $1.50/year? the ROI is better if you skip eating out for lunch 1 day every 2-3 years.