Anthony Watts has a great article up on how he changed out a fixture that used a CFL Flood Lamp to one using an LED lamp. Anthony bought 5 LED fixtures and got a deal. He paid $80.00 each for them. So let us run some numbers.
|Cree LED Lighting LR6-GU24 White 6||$80.00||50,000||12|
|GE 47478 15 Watt (65 Watt equivalent) Energy Smart Floodlight 6 Year Life R30 Light Bulb||$6.25||10,000||15|
For 50,000 hours You pay $31.25 capital
In 50,000 hours you save 150,000 Wh or 150KWh with the LED fixture. The LED fixture costs $48.75 more than 5 CFLs . If your electricity costs less than 32.5¢ a KWh The CFLs are a better deal.
On new construction or when replacing a fixture the cost of the fixture enters the picture. Don't forget to figure out what it is worth in time and hassle changing bulbs more often vs installing a fixture. Another point is that you can dim the LEDs and the CFLs do not dim. Dimming the LEDs should add to their life since ordinary LED lifetime is roughly proportional to current. Not only that: light output per watt goes up at lower currents.
My advice to cheapskates? At 10¢ a KWh wait until you can buy one for $45 or less. A couple of CFLs should see you through.
Those are the economic issues - roughly. As Anthony points out there are other considerations. And thank you Antony for being an early adopter. It will help bring the price down to one I can afford.
Cross Posted at Classical Values