John, I believe the unit you are thinking of is lumens.
LED torches are normally intended to be used by bushwalkers, cavers and
mountaineers. Their effectiveness depends on the quality of the
reflector.
Regards, Laurie.
On Friday, August 3, 2007, at 07:28 PM, John Leonard wrote:
I have just purchased a small LED torch. It is only a small one and
uses
only one AA battery, but it is amazingly bright. If I had a larger one
(using C batteries) I'd be confident taking it spotlighting. They also
promise longer battery life for this type of torch. However I have
only seen
small LED torches, does anyone know if larger sizes are currently
available?
And does anyone know about the effect of LED light on nocturnal bird or
mammal eyes" My little torch is dazzling, it has a bright white light,
like
a fluorescent, only brighter, not like the yellow light of incandescent
bulbs. Presumably the effect of LED light on night creatures eyes
would be
the same or worse than convential spotlights, does anyone know? And
how do
you measure the brightness, not by wattage?
--
John Leonard
Canberra
Australia
www.jleonard.net
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