| Electronics > Beginners |
| Help identifying an LED and also an application question |
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| TT_Vert:
I have a car mirror which has a yellow color temperature which I want to replace w/ a white LED. I've disassembled the mirror and found the LED to be a type I've never seen. It looks like a transistor that has the hole in it to mount to a heatsink. My first question is, the way they designed it is using two different colors. The center leg is ground the left leg is blue and the right leg is orange. They are both illuminated together to make this yellow color. My questions is why would they do this? I checked the forward voltage and the amber draws 20mA at 2V and the blue 20mA at 3.3V. My second question is, what is the name of this LED form factor? Third is, can I just get away w/ a 5000K LED In this form factor and modify resistors as required to get correct current limiting? The way this is designed I really need to stick w/ the existing form factor. I looked on mouser and I cannot seem to find anything like this and nothing in amber/blue. I included a quick drawing I did. The top hole is the mounting hole. Thanks guys Dave |
| rrinker:
I would suspect that it does more than just light up with that one color. Different conditions or settings would probably activate just the blue or just the orange. Possibly options you don;t have in the car this came from, but are available, or maybe something that isn't frequently encountered. I can't imagine they would ever use a dual color LED just to make other other color that is readily available as a simple LED. Frankly - if this is on the side facing the driver, I would NEVER use a white LED, it's distracting and more harmful to night vision than other colors. |
| Zero999:
It probably adjusts its colour, depending on the ambient lighting conditions. Why do you want to change it? |
| Domagoj T:
Is this what you're looking for? http://www.farnell.com/datasheets/526930.pdf |
| TT_Vert:
Thanks guys. To clarify this is an aftermarket mirror by gentex for my convertible. The LEDS illuminate when door is opened and also when i turn on the lights w/ the switch (Always the same warm white). I want to go to a more white cool white LED as I do not like the warm white color temp and all the other LEDS (footwell, etc) are a cool white (around 5000K). There is no other functionality with these lights and the way this is designed it is only downward facing light in chrome light direction bezels so they cannot be used to illuminate buttons, etc. That's sort of why I am confused as to the reason they'd use both colors to make one color. It could be that given this mirror design is probably over 10 years old he technology just wasn't there? @Domagoj T htat is the correct form factor (maybe a bit smaller but close) but only a 2 leg whereas the OE is a 3 leg. I suppose I could squish the legs together a bit to make that work if need be. Dave |
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