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Re: filmscanners: LED Illumination for Film Scanners



That didn't go off-list, did it? :-(
Sorry--LRA


>From: "Lynn Allen" <ktrout@hotmail.com>
>Reply-To: filmscanners@halftone.co.uk
>To: filmscanners@halftone.co.uk
>Subject: Re: filmscanners: LED Illumination for Film Scanners
>Date: Sat, 23 Jun 2001 02:55:41 -0000
>
>Hi, Art, you wrote:
>>I also expect, like incandescents and other illumination sources, LEDs
>can be built to different specs and be run under different electronic
>designs.  For instance, I know that with the halogen bulbs used in
>projectors, a "25 hr" bulb will last only 5-11 hours run at 125-130
>volts, will last 11-19 hours run at 120-125 volts, they last upwards of
>19-31 hrs run at 115-120 and if you use a dimmer to bring them down to
>about 105-110, they will last well over 50 hours, or nearly one order of
>magnitude from running at 125-130 volts.
>
>This is so darned off-topic that I'm going off-list, but aren't halogen
>bulbs supposed to be used with direct current? That would presuppose an
>ac-dc converter, which could/should deliver optimum power for the device,
>unless you're using one tagged to a variable battery-charger.
>
>Granted that Manufacturer Specs are almost always overstated, halogens are
>the most reliable light devices I know of. LED's are another matter, and
>idealy they're run from DC as well, although it isn't a requirement since
>they modulate the power themselves, AFAIK. OTOH, they come in all flavors,
>and one isn't the same as another.
>
>Whatever--I just wondered how Austin got us so far off-topic. ;-)
>
>Best regards--Lynn
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