Comments on: LED vs CFL vs New HEI Energy Efficient Incandescent – Lightbulb Shootout

By: Thomas

Thomas — Tue, 15 Sep 2009 08:44:57 +0000

Hi
Great article!
Was wondering how the Average Lifespan of a LED bulb changes when the voltage varies?

By: Nail wang

Nail wang — Thu, 10 Sep 2009 16:55:04 +0000

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ShenZhen Greenergy lighting Co.,Ltd
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By: Kim

Kim — Mon, 07 Sep 2009 00:46:45 +0000

I really like the new LED bulbs we’re seeing. I’m optimistic that we will see the same trend in cost as we did for the decorator string lights. A few years ago they were VERY expensive compared to traditional string lights. Now they are about the same cost and use about 1/10th the electricity.

Kim

By: Andrew

Andrew — Fri, 28 Aug 2009 12:11:30 +0000

With energy efficiency awareness growing, and new lighting technologies being developed at and the more recent popularization of Compact Fluorescent Light (CFL) bulbs due partly to their electricity savings and partly from huge discounts and government energy rebates making them more affordable.

By: Jean-Paul

Jean-Paul — Mon, 24 Aug 2009 15:26:04 +0000

@James Mahon

Thanks for the correction! My original calculations were based on potential output for optimal LED technologies which have not been developed yet (although i unfortunately did not note that). I have updated the post to reflect those correct figures. Lets hope they do make it there someday soon.

-JP

By: James Mahon

James Mahon — Sun, 23 Aug 2009 20:37:09 +0000

The figures for the LED lamp are wrong.
It generates 230 Lumens @ 7 watts at a colour temperature of 4200K which is a daylight white (i.e. will look blue indoors).
This equates to approx 33 L/watt, not 141.6 as suggested, or one fifth the efficiency you quote.
Here is a reference
http://www.dotlight.de/products/en/Illuminants/LED/Socket-E27/High-Power-LEDs/Philips-MASTER-LED-E27-7W-white.html

If you want energy efficiency, get CFLs, unless you want to dim them, or switch them on and off rapidly.

In a couple of years, LEDs may get there, but they are a long way off + their cost per lumen is off the scale.