Originally Posted by Dirty
So, Since the Internet
seems to have degraded into a venue for people to sell things, I can't seem to find any information.
That being said I am wondering why it is that an LED light would heat up?
I have Tried the obvious such as checking the wiring
I have also re-soldered the connections directly to the LED plate thinking that maybe they might be loose....
Any Advice would be nice.
First is how a LED works.
It's a semiconductor that uses different chemicals to determine the color output.
You can't control the voltage drop. It's controled by what the LED is made of. For light in the white range it's about 3.5 VDC.
Next is it is a current device. If you control the current you can make it put out light. So if you forward bias the LED (diode) with enoough voltage (3.5V) and supply a current the LED will produce light. The designers can vary the current thru the device.
The specifications from the designers specify 20ma (millamps) as a good point. You get so much light at that point. Less current for less light and more current for more light.
Heat is generated with every semi-conductor junction. The heat is measured in watts using the formular watts = volts X Current.
So for this case its the 3.5 volts times the 20 MA or 3.5 X .020 = .07 watts.
.7 watts is not much. If you touch the LED you would most likely feel some heat. The light output is much greater than of a tungston light with the same current. That amount of current thur a tungston light would most likely not cause the tungston to glow to produce light.
The more current you put thru the LED the brighter (more light) is produced. More heat is generated or consumed by the LED. Heat is one of the main cause of falure for semi-conductors.
So the designers of LED went down the path of lets have a path to get rid of the heat. They designed and manufactured LEDs on a heat sink. With this design more current can be used in the LED with the heat sink removing the heat, the LED will produce more light and last a given amount of time. I've seen design specs with 400 ma as the working current.
So now we are at 400 ma times 3.5 volts or 1.4 watts. Still a lot better than the tungston light.
So the answer to your question of ,
Originally Posted by Dirty
That being said I am wondering why it is that an LED light would heat up.
is heat is always produced in a semi-conductor (LED) junction. The amount of heat generated can by regulated by the current thru the LED.
What did you buy? Provide the link to the device so I can see exactly what you bought.
You also mentioned soldering to a plate. I can olny assume that you bought one of those so called high powered LEDs. Individual LEDs have pins not plates. Does it have a built in current regulating circuit? If you just bought the LED assembly you still have to have a way of rugulating the current thru the LED. If you don't regulate the current and put too much voltage across the LED you will generated lots of heat and most likely have a thermal runaway as others have posted.
Hope this helps.