LED lights are currently not as bright as halogen technology and certainly
nowhere near as bright as HID, which in a rule of thumb is five times more
efficient assuming equal reflector technology is applied.

Hewlett Packard, in ine with their competitors are making inroads very
rapidly into LED technology and certainly for the last six years medium
output, ie  0.2-0.5 lumen LEDs have been available.

At Paris airshow last year 3 lumen leds were on disply for passenger reading
lights. An array of around 15 of these would equal an 11.5 watt halogen at
28 volts output from a reading quality viewpoint.

LEDs will exceed halogen lamps within the next ten years for low to medium
light outputs, which, together with a mtbf of around 250,000 hours menas
that lamp head changes will be a ting of the past.

Another thing to keep in mind. light colour is more important than light
intensity. 2000 lumens north daylight is far better for the human eye to
view with than 3,000 lumens of incandescent yellow as emmited by a halogen
source, therefore an HID or LED lightsource, which in HID is more
blue/violet and LEDs are easy to tailor the emmision band to blue/white does
not need the same measured light output for the same eye efficiency in use.

Cheers.


Paul


----- Original Message -----
From: Patrick Duffy <pduffy@al*.ne*>
To: Michael O'Donnell <mooseo@st*.ed*>
Cc: <stuart.morrison@sw*.co*.uk*>; <techdiver@aquanaut.com>
Sent: Wednesday, April 12, 2000 9:19 AM
Subject: Re: Lightwave LED lights


> Michael,
>
> I think you might have been looking at the wrong page.  They do have a
light
> rated to 300' with a Lexan body and 1 LED (100 hrs), 2 LEDs (50 hrs) to 3
LEDs
> (25 hrs).
>
>     http://www.theledlight.com/100000hour.html
>
> Someone told me recently (actually today) that they had an LED light and
that it
> was not as bright as a normal light.  If that is true, the life of the
battery
> is not as important as how bright it is.  Either way, neat idea and good
price.
>
> Patrick
> --
> The "El Cheapo" Oxygen Analyzer Web Page
> http://home.beseen.com/sports/mk15/index.html
>
>
> Michael O'Donnell wrote:
>
> > from their web site:
> > http://www.theledlight.com/lightwave.html
> >
> > Waterproof, not just water resistant, to 2 feet - not
> >                   for scuba diving.
> >
> > still, the lamps look good.  I'm ordering one for my mag light... should
> > make the batteries last longer.
> >
> > At 11:42 AM 4/11/2000 +0000, stuart.morrison@sw*.co*.uk* wrote:
> > >Hi All,
> > >
> > >anyone any experience in using Lightwave lights underwater. They use
> > >white LED's so there is no bulb to blow, they burn for 300hrs+ on one
set
> > >of ordinary batteries, 100,000hrs life of the LED and can survive a 3m
> > >drop on to rock -- or at least so the manufacturer claims. They are
also
> > >said to be totally waterproof.
> > >
> > >A lot of dry cavers are moving to LED lamps rather than normal filament
> > >bulbs, and if the manufacturer's specs are to be believed then they
would
> > >seem like an ideal back-up light for diving. There is always a
downside,
> > >and I was wondering if anyone had tried them out and could give some
> > >feedback.
> > >
> > >Regards,
> > >
> > >S
> > >
> > >
> > >.
> > >
> > >
> > >
> > >Visit our web site at www.scott-wilson.com
> > >
> > >Privilege and Confidentiality Notice.
> > >This e-mail and any attachments to it are intended only for the party
> > >to whom they are addressed.  They may contain privileged and/or
> > >confidential information.  If you have received this transmission in
> > >error, please notify the sender immediately and delete any digital
> > >copies and destroy any paper copies.
> > >Thank you.
> > >
> > >
> > >Scott Wilson Scotland Ltd
> > >Registered in Scotland No. 48951,
> > >Registered Office: 6 Park Circus, Glasgow, G3 6AX. UK.
> > >
> > >
> >
>___________________________________________________________________________
> > >_____
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> > >
> > >--
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