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

From: Rod Speed (rod_speed_at_yahoo.com)
Date: 03/21/05 

Date: Tue, 22 Mar 2005 04:51:15 +1100

"Anthony Matonak" <res04ijs@gte.net> wrote in message
news:xax%d.6061$uw6.4861@trnddc06...
> 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?
>
> Yes. A White LED is about as efficient at turning electricity into
> light as, say, a 60W 120V incandescent bulb. This is many times the
> efficiency of the little incandescent bulbs used in flashlights.
>
> A single color LED (Red, Amber, Green, etc) is even more efficient
> and makes for great traffic signals or turn signals on cars but
> that monochrome light makes for a lousy flashlight.
>
> LEDs also have a characteristic that the more drained the batteries
> become, the less they consume. This is opposite typical flashlight
> bulbs that consume more the less power left in the batteries.

Completely and utterly garbled with simple devices like a torch.

> This means that with an LED the light slowly gets dimmer and dimmer but it can
> take a long time to go out entirely. It's not uncommon for some LED
> flashlights to still produce dim, but usable, light after 24 hours on a single
> set of batteries.

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