ERD50
Give me a museum and I'll fill it. (Picasso) Give me a forum ...
Yes, surely having the lights on more would have a greater effect than the type of bulb one uses.
Surely?
A filament bulb uses about 4x the energy that an equivalent CFL or LED does. So you could switch bulb types from filament to CFL/LED and have the lights on four times as much and there would be near zero effect on the bill.
That's a LOT more 'lights on' time, for no effect. How do you come to your conclusion?
I stand by my original statement, a person is unlikely to be able to parse out the bulb type savings across all the variability in a month-to-month bill. Better to make a good estimate of usage and calculate it on a spreadsheet.
-ERD50