|The math is simple enough if you have accurate data on your current usage. For example, if you replaced 10 60W incandescent bulbs which are on 6 hours per day with 10 of the 13W CF equivalent bulbs, then over a 30 day electric bill you'd see:|
10 x 60w x 6hr x 30days = 108kWh
10 x 13W x 6hr x 30days = 23.4kWh
Electricity savings of: 84.6kWh
If your paying $0.10 per kWh for your electricity, then you would see an $8.46 savings on your monthly electric bill.
In terms of "total energy" consumed to provide the same amount of light, it is very important that the CF bulbs last many times longer than the incandescent bulbs because they require a LOT more energy to make.
But, I do not know what this has to do with "digital home" electronics, these are not digital devices.