- 40 Watt incandescent
- 40 Watt CFL
- 40 Watt LED
I’m gonna try and see how big the difference is between the three and how long the payback period is for switching.
I started with the incandescent bulb and let it burn for 72 hours. When I turned off the lamp at that time, the bulb had consumed 2.93 KWH. At 17.01 cents per KWH, that bulb cost me $0.498 to run for those three days. Or .7 cents per hour. The bulb itself cost me $1.00. Further, the life of the bulb is listed as 2,000 hours.
Here’s what it looks like:
|Bulb||Cost per Bulb||Cost per KWH||Cost per hour||Lifespan||50,000 Hour Cost|
I’m using a 50,000 hour cost because the LED bulbs are rated for 25,000 hours. Imagine, 25,000 hours. THAT is a long time.