[red-beard]

I sell LED lights, but mostly for off-shore and remote locations. If you wish to understand your savings you will need:

1. The price you pay (on average) per kWh of electricity
2. The specific number of lights you wish to replace and their power level
3. The number of hours you have the bulbs turned on each day (on average).
4. The price difference between the LED bulb and the bulb you are presently using
5. The power difference between the LED bulb and the and bulb you are presently using

Here are my numbers

1. $0.089 /kWh
2. We will use 1 bulb, 120 Watts (Outside night light)
3. Outside night light, 12 hours per day
4. Led=$40, Regular $3
5. LED = 20 Watts

Power difference per day = 1200 Watt Hours = $0.1068 per day
Cost difference is $37.
Basic savings to pay for the difference in cost is 346 days of operation about a year.

So for an external, high power light, used a lot, it is VERY cost effective.

If the usage is 6 hours per day. It would require double the hours. If the power usage is lower, it may require even more time to pay back.

CFLs, are a lot cheaper than LEDs. They use around twice the power.

Where LEDs make sense are where the price of electricity is very high and/or when changing the bulbs is very expensive.