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Question about Luxeon Star LED Answered

Ok, so I am guessing many of you know about the Luxeon LED's. I have just one question. Where in the world do you connect the wires from the Battery snap and switch to on the star? Where on the picture below do I put the positive and negative leads? Thank you so much in advance. -Brennn10

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scubascooby
scubascooby

12 years ago

I am thinking of converting my old backup diving torch from incandescent to LED. I think it has a 6W halogen that is past it's sell-by-date and would like to use a Luxeon K2 The torch has 3 C-cells (NiCd or MiMh) so supplies about 3.75V Due to the very cramped design I wondered if I can avoid using a current limiter ? The K2 would sit on a metal backing disc (1" or so) and hopefully will sink it's heat into the cells and then into the surrounding water.

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gamer
gamer

13 years ago

If it's a real luxeon, it should be written "Lumileds" on it. Those have 2 positive pads and two negative pads. Now take a good magnifying glass, look close to the pads, and see the plus signs and the minus signs. Both plus are the same, it doesnt matter which one you use. Same thing with the minus. See the picture provided.

C:\Documents and Settings\Jimmy And Jason\Desktop\for instructables luxon question.jpg
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Brennn10
Brennn10

Reply 13 years ago

Thanks! That answered my question fully!

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gamer
gamer

Reply 13 years ago

no problem, one question, what are you gonna make with the luxeon, im just curious - gamer

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Brennn10
Brennn10

Reply 13 years ago

Ohh, probably just another flashlight. Maybe a PVC case or an Altoids tin. I lvoe working with the tins.

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gamer
gamer

Reply 13 years ago

Be Sure to respect the specs of the led. Luxeon stars are leds, they are not voltage driven, they are current driven. Be sure to remember that, so maybe think about putting a resistor, it will keep your led safe

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Ed65
Ed65

14 years ago

LEDs are current sensitive devices so you may want to add a resistor in your circuit to limit current as needed per the Luxeon spec. sheet. Too much current will be destroy your LED. Voltage, within reason, isn't that cirtical but I'd follow specs. anyway. A simple way to limit voltage is a with a voltage divider which is just a couple of resistors . Look online for details. Hope this helps. Ed65

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trialex
trialex

14 years ago

The solder pads! Luxeon's generally have more than one positive and negative each to allow you to spread out the current. Should be easy to determine which are connected if you aren't sure by using a multimeter.

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Brennn10
Brennn10

Reply 14 years ago

Thanks guys. One more question. Do you think I should use two AA batteries or use a 9Volt and a resistor? The one I am looking into purchasing has a forward voltage of 3.4V, so the AA would work fine right?

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trialex
trialex

Reply 14 years ago

AAs will work, but you'll need more than two. Neither of the battery options will last a particularly long time, but three AAs in series will be better than the 9V.

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trebuchet03
trebuchet03

14 years ago

Don't forget to heat sink those suckers ;) They typically won't last long without a good way to dump heat -- which will get expensive quick...