Cree LED Light Bulb

Cree LED Light BulbI’m a big fan of Cree LEDs. I use them in almost all my flashlights. Last month, a Cree LED light bulb was introduced that replaces a 60 watt incandescent bulb. (Cree Press Release) The bulb retails for $12.97.

Specifications from Cree:

  • 9.5 Watts (84% less energy)
  • 800 Lumens brightness
  • 25,000 Hour rated lifetime
  • $1.14* Annual energy cost
  • Lifetime savings: $139*
  • Warm color temperature: 2,700K
  • Lights instantly, omni-directional
  • Mercury free
  • Safety-coated glass
  • Dimmable
  • 10-Year Limited Warranty
  • UL damp rated
  • Fits most lamps
  • Diameter: 2.4 inches
  • Length: 4.6 inches

*Cree’s calculation of $1.14 yearly operating cost is based on 3 hours/day and $0.11 per kWh. Cree’s lifetime savings calculation is based on $0.11 per kWh when compared to 60W incandescent and 25,000 hour lifetime.

It seems that the Cree LED Light Bulb is only available so far from Home Depot. I bought my bulb online from Home Depot and with $1.17 sales s surprised that the light bulb’s envelope felt like it had a rubber coating. It has a standard North American Edison screw E26 socket. I replaced a 15W warm compact fluorescent bulb (CFL) that was in a table lamp with the Cree LED Light Bulb. The LED seems brighter.Cree LED Light Bulb Packaging

When I removed the lamp shade to photograph the bulb, I noticed that the bulb was hot enough so that I couldn’t hold it – so despite consuming only 9.5 watts, it still gets very hot. There is a heat sink around the base of the envelope.

When I photographed the illuminated bulb, I set the camera’s color balance for daylight, so the yellow color of the light reflecting off the wall in the background is a good representation of what it looks like to the human eye.

For the chart below I used the following cost assumptions:
Incandescent bulbs: GE 60-Watt Reveal A19 General Purpose Incandescent Light Bulb (6-Pack) $8.77 ($1.46/bulb, 1000 hour life)

CFL bulbs: Feit Electric 15 Watt ( Mini Twist Dimmable Light Bulb (12-Pack) $104 ($8.67/bulb, 8,000 hour life)

LED bulb: Cree 9.5-Watt A19 Warm White (2700K) LED Light Bulb (1-Pack) ($12.97 25,000 hour life)

Cost of electricity from PG&E, about $0.13/kWh.

To get 25,000 hours with a 60 watt incandescent bulb, you would need 25 of them, at a cost of $36.50. The cost of 4 CFL bulbs for 25,000 is $34.68. The cost of the Cree LED bulb for 25,000 hours is $12.97.

There’s no question about the cost savings of the LED bulb versus incandescent. Total cost for 60 watt incandescent bulbs for 25,000 hours is $231.50. Total cost for 15 watt CFL bulbs for 25,000 hours is $83.43. Total cost for a 9.5 watt LED bulb for 25,000 hours is $43.85.

People who want to keep using incandescent bulbs may not be able to do the math or maybe they’re using them to keep their popcorn warm.

Incandescent vs CFL vs LED Cost Comparison

LED Breakthrough…2X More Efficient than ANYTHING

adrrain67 over at digg.com writes, “LEDs are fantastic. But for a long time, they’ve been fantastic more because of what we think they can do than what they actually do. We’ve been pretty sure that LEDs can produce warm, white light at efficiencies far beyond even the much-touted compact fluorescent bulbs. But we’ve yet to actually see that.

I bought this RLM type industrial reflector to put in our carport, with the intention of lighting it with LEDs. The first iteration involve a string of white LED Christmas lights mounted through holes drilled in a board. Then I thought about a 110 VAC LED lamp, but most are down firing and wouldn’t use the reflector. Now I am looking at an LED driver puck like this, and a Cree LED mounted on a heatsink.

read more | digg story