Re: Be careful with LED DRL's
Originally Posted by Jones223
What is your definition of very very hot? Do all transistors run hot enough to melt insulation and plastic? I think not.
Yes LEDs are cool to the touch but they generate considerable heat in the background circuitry thus the large heat-sinks we see behind the 12V MR16 lamps. It's not there for show. The current lot of replacement automotive LEDs have no where near this amount of heat-sinking so little wonder we are having problems.
Some sellers are selling both "CAN bus" and "NOT SUITABLE FOR DRL" 3157 LEDs. The "CAN bus" LEDs have a ballast resistor and the others don't. The resistor is intended to draw off additional current to fool the CAN bus into thinking it has an incandescent lamp. In drawing off the current, the resistor would be generating an additional 2-3W of heat. I'm wondering if the people experiencing the overheating LED problem are using the "CAN bus" LEDs.
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