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RE: [APD] LED Lighting

I work in the electrical engineering department of an Architecture and Engineering firm. We often get lighting vendor reps comming in to demo products. One product that was very interesting was a wall-wash LED unit that used rows of different collored LEDS to create very even light across a flat surface. It did a very nice white, and pretty much every color inbetween. It could be programed to switch colors, dim/brighten, link multiple units together to get a moving color display, lots of options. IF I remember correctly it had one row of red leds and two rows of blue and green.

Granted a single unit was about 1200, but it certainly showed some potential for LEDS.

This isn't the actual product I saw in the demonstration, but it is similar.


Click on the color blast products. Maybe the cutsheets can offer a little info for those who want to experiment.

From: "Jim Seidman" <js5 at seidman_net>
Reply-To: aquatic plants digest <aquatic-plants at actwin_com>
To: <aquatic-plants at actwin_com>
Subject: [APD] LED Lighting
Date: Mon, 5 Jan 2004 11:34:16 -0600

I've been catching up on the weekend's discussion on LEDs. I think they're
more feasible than some are giving them credit for.

First, single-color LEDs are much more efficient than white ones. Most
white ones use phosphorescence just like fluorescent bulbs. That is, they
create either UV or blue light, and then use phosphors to convert it to
white. By making an array of different colors, you could get a pretty
efficient spectrum that compares to almost any correlated color temperature
you could name. You should be able to get a better CRI than many
triphosphor fluorescent bulbs.

Second, If you have lighting throughout your hood, the directionality of
LEDs seems like an advantage. We all know how much light from fluorescents
is lost out the sides, and while reflectors help they aren't perfect. LEDs
are small enough that even with only a 20-degree dispersal, you could avoid
dark spots.

Lastly, there's the advantage that LEDs are dimmable. With the right
controller, you could have fantastic sunrise/sunset/moonlight effects.

If I had more time I'd certainly be playing with them.

- Jim

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