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  #73  
Old 02-17-2012, 06:58 PM
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Re: Be careful with LED DRL's

It's not the LEDs that get hot....it's the transistor.
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  #74  
Old 11-22-2012, 05:17 AM
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Re: Be careful with LED DRL's

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Originally Posted by Jones223 View Post
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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Old 11-22-2012, 05:32 AM
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Re: Be careful with LED DRL's

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Originally Posted by SixZeroFour View Post
Does anyone else also have a discoloration mark on the grey base that the bulb plugs into, specifically two slight marks on either side?
Yes I do! My guess is that the grey plastic base is being scorched by the heat of the bulb. The evaporating vinyls are then condensing on the reflector producing the cloudiness. Seems to me that the base is not up to the task. The same thing has probably always happened in tail lights but no body ever noticed or cared.
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