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Topic:
do any of you who do LED lighting run low voltage to the LEDs themselves?
This thread has 19 replies. Displaying posts 16 through 20.
Post 16 made on Friday November 14, 2014 at 14:03
thecynic315
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On November 13, 2014 at 17:00, fcwilt said...
Are you putting this resistor on the output of a 120 VAC dimmer - because the LED alone does not present enough load for the dimmer to work correctly?

Yes, on two fixtures I had to do this. It presents the equivalent of a 10w INC.

In a trouble shooting guide it was stated to add a 10w INC, I thought that to be dumb so talked with some EEs, tech guys, support guys, and mouser to come up with this.
Post 17 made on Friday November 14, 2014 at 14:59
fcwilt
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On November 14, 2014 at 14:03, thecynic315 said...
Yes, on two fixtures I had to do this. It presents the equivalent of a 10w INC.

In a trouble shooting guide it was stated to add a 10w INC, I thought that to be dumb so talked with some EEs, tech guys, support guys, and mouser to come up with this.

I understand why it works BUT you might want to use a higher wattage resistor next time.

120 VAC across 1400 ohms works out to a bit more then 10 watts.
Regards, Frederick C. Wilt
Post 18 made on Friday November 14, 2014 at 15:38
thecynic315
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On November 14, 2014 at 14:59, fcwilt said...
I understand why it works BUT you might want to use a higher wattage resistor next time.

120 VAC across 1400 ohms works out to a bit more then 10 watts.

11 and change.

That's all that was/is needed. For the most part I haven't had to do this on newer jobs and the 'trons keep coming out with better and better equipment to handle LEDs (fixtures and bulbs).

Also the designers are learning which manufactures are using GOOD drivers and garbage so lately my only problem has been sparky not running/attaching the 0-10v wires!
Post 19 made on Friday November 14, 2014 at 16:33
juliejacobson
CE Pro Magazine
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On November 13, 2014 at 23:31, Ernie Gilman said...
One year at CES I saw a totally new thing. They called it a plasma display, and it had gone from theory to reality. It was about a dozen inches in size. There was a note saying that that unit at that time would sell for about $100,000. "Expensive" should not be a deterrent for the first units!

I think POE lighting is the future, for sure. Lumencache and NuLEDS (kickstarter noted above) are making great strides. NuLEDS was the company that former Niles president Frank Sterns joined for a time.
"CEPro: your website sucks!" - Fins
www.cepro.com
[Link: twitter.com]
Post 20 made on Friday November 14, 2014 at 16:42
bcf1963
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On November 14, 2014 at 15:38, thecynic315 said...
11 and change.

Keep in mind that if you run a power resistor at its rated power, it will heat somewhere around 70C... about 158F! This could be a problem in a wall box, especially in close proximity to other dimmers.

I don't like things getting that hot. My rule of thumb is to buy a resistor of twice the power rating... which seems to keep the temperatures more in the range of 40C and below.
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