Re: new LED torch (flashlight) bulbs more efficient?

From: Duane C. Johnson (redrok_at_redrok.com)
Date: 03/21/05 

Date: Mon, 21 Mar 2005 06:29:13 -0600
To: Ed Earl Ross <edearl@satx.rr.com>

Hi Ed;

Ed Earl Ross <edearl@satx.rr.com> wrote:
> ghbt wrote:

>> Do the new LED torches (flashlights) actually give more value for
>> money from the batteries ( in terms of illumination per cost of
>> batteries) than the previously developed small and bright xeon bulbs
>> or the older ordinary torch bulbs?

> LED produce very little heat compared to incandescent bulbs,
> which means LED are very efficient at producing light compared
> to incandescent.

White LEDs have an efficiency of about 5% or less.
Halogen incandescent lamps lamp are about 4%.

In other words 95% of the power given to white LEDs
is lost as heat.

Sure white LEDs produce little heat but they produce
little light also.

> LED are more efficient than fluorescent lights, too.

This is flat out wrong.
White flourescent lamps are about 10% efficient.

Duane 

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