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Old 04-07-2012, 06:19 PM   #1
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Led light warning!! Can cause fire!!

http://www.irv2.com/forums/f84/led-lighting-118040.html

THE ABOVE LINK SENDS YOU TO A POST ABOUT LED LIGHTS I USED. DO NOT!!! USE THEM

In the above thread, I talked about these great lights I found and how to wire them up. I had only left them on for 15-20 minutes before, but today I left them on and they got so hot, one of them actually caught the adhesive backing on fire! I don't know why they get hot, but they do. I had 10 of them made up and all of them got hot. Not a little bit hot, REAL HOT! I left a warning about them on the original thread. danger, danger, danger.
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Old 04-08-2012, 10:32 AM   #2
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Quote:
Originally Posted by CharlieTwo View Post
http://www.irv2.com/forums/f84/led-lighting-118040.html

THE ABOVE LINK SENDS YOU TO A POST ABOUT LED LIGHTS I USED. DO NOT!!! USE THEM

In the above thread, I talked about these great lights I found and how to wire them up. I had only left them on for 15-20 minutes before, but today I left them on and they got so hot, one of them actually caught the adhesive backing on fire! I don't know why they get hot, but they do. I had 10 of them made up and all of them got hot. Not a little bit hot, REAL HOT! I left a warning about them on the original thread. danger, danger, danger.
I suspect it had more to do with your wiring than an inherent danger.
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Old 04-08-2012, 11:22 AM   #3
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One thing to watch for in these lamps - some manufacturers build a voltage regulator into the sockets. If you replace them with your own socket you may be over driving the lamps, causing them to overheat. This may not be the problem describes here, but something to consider.
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Old 04-08-2012, 11:55 AM   #4
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Main design problem when working with LEDs is heat.. Specially running off AC
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Old 04-08-2012, 12:11 PM   #5
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Jim is right LED's operate on very low voltage and current therefore they put
in a resistor to limit the current and voltage. On some it is done in the LED and
others it is in series with the positive lead of the LED. Yes they have positive and
neg leads. It sounds like they are being operated way over spec's for them to get
hot.
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Old 04-08-2012, 01:11 PM   #6
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I agree with wb&auk. LED lights need a current limiting resistor. Regular incandescent bulbs have built in resistance as the nature of the beast. LEDs need a resistor added. There are numerous websites that educate you on this need:

How to wire an LED, Tutorial and Calculator

Also calculators for the size of resistor required, for single and parallel LED installations:

LED Calculator - Current limiting resistor calculator for LED arrays
LED series parallel array wizard
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Old 04-08-2012, 02:03 PM   #7
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I have worked with LED's for a long time. IF you design correctly they do not overheat but some folks will try to overdrive the LED to get more light, this works, but it also seriously shortenes the life of the LED and generates more heat.

Another issue applies to 120 volt LED night lights and such, How do they get the voltage down to what the LED needs.. One common method is senistive to the type of inverter you use.. TRUE sine wave, no sweat, MSW, SWEAT, then it starts a fire.
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Old 04-08-2012, 02:57 PM   #8
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There are no resistors in the led panel. I took one apart. If you put 12 volts to these lights as they come from the vendor, they will overheat. You could figure out the resistance needed but........ from the factory they will overheat if continually used. There is no resistor in the adapters they use........... warned is warned.
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Old 04-08-2012, 03:41 PM   #9
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What voltage are they running off of?

My MH has all 12v lighting.
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Old 04-08-2012, 04:03 PM   #10
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It is running off of 12 volts.
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Old 04-08-2012, 04:21 PM   #11
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Thanks. I was looking around at "bulb replacements." I don't see anything that pertains to the problem ya'll are having. Doesn't mean it doesn't exist, it just may not be reported. My concern is when they say there is an LED replacement bulb. If it is a replacement I would "assume" (my problem) that it would be a direct match for the receptacle.

I'm going to do a lot more studying on this subject. Thanks for the heads up.
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Old 04-09-2012, 10:43 AM   #12
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Quote:
Originally Posted by wa8yxm View Post
I have worked with LED's for a long time. IF you design correctly they do not overheat but some folks will try to overdrive the LED to get more light, this works, but it also seriously shortenes the life of the LED and generates more heat.

Another issue applies to 120 volt LED night lights and such, How do they get the voltage down to what the LED needs.. One common method is senistive to the type of inverter you use.. TRUE sine wave, no sweat, MSW, SWEAT, then it starts a fire.
Not sure about the fluorescent lighting in my RV but ALL of the rest is running on 12V.

And, I noted that one of the calculatores shows a circuit for LEDs having them in series. Everything I have read in manufacturer specs says to NEVER put LEDs in series. Always have a limiting resistor for each lamp.

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Old 04-09-2012, 05:19 PM   #13
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Quote:
Originally Posted by Wayne M View Post
Thanks. I was looking around at "bulb replacements." I don't see anything that pertains to the problem ya'll are having. Doesn't mean it doesn't exist, it just may not be reported. My concern is when they say there is an LED replacement bulb. If it is a replacement I would "assume" (my problem) that it would be a direct match for the receptacle.

I'm going to do a lot more studying on this subject. Thanks for the heads up.
Plenty of replacement LEDs being sold for vehicle turn/stop lights that have to have a resistor that is never mentioned..
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