LED's in Dome, won't turn off?
LED's in Dome, won't turn off?
I recently put in the 4 LED bulbs in my dome light, and i notice when there off they are still being illuminatied just a little bit. but i can see the white light. they also don't fade like the stock did, which i miss....
any help?
thanks
any help?
thanks
It happened on my accord when i put in the led bulbs. Did you put the switch to off? Turn it on to door and the light will go away. I dunno if it does this on the G. I haven't install leds in my sedan so i don't know if it will do that.
short answer, they are poorly made.
long answer....I had that problem too with cheap festoon LEDs. what's happening is that the dome light circuit is negatively switched. what that means is that when the door is opened or you flip the switch on, one of the leads to the light goes to ground and completes the circuit. When the light is off both leads to the light will actually be given +12 volts and since there is no potential across this there is no light. BUT since the positive voltage is actually going across different paths in the wiring there is a very small difference in resistance in the wiring, this is giving off a very small voltage differential between the two leads.
now comes the problem with the cheap festoon leds. they typically overdrive the leds which is why they always burn out so fast. I've gotten anywhere from 1 to 3 months on those things before they start to burn out. When they overdrive the leds they using a too small resistor value, and the small amount of differential voltage in the dome light circuit is enough to give off a faint amount of light. If the resistor was higher then the voltage would not be enough to overcome it and light it up.
long answer....I had that problem too with cheap festoon LEDs. what's happening is that the dome light circuit is negatively switched. what that means is that when the door is opened or you flip the switch on, one of the leads to the light goes to ground and completes the circuit. When the light is off both leads to the light will actually be given +12 volts and since there is no potential across this there is no light. BUT since the positive voltage is actually going across different paths in the wiring there is a very small difference in resistance in the wiring, this is giving off a very small voltage differential between the two leads.
now comes the problem with the cheap festoon leds. they typically overdrive the leds which is why they always burn out so fast. I've gotten anywhere from 1 to 3 months on those things before they start to burn out. When they overdrive the leds they using a too small resistor value, and the small amount of differential voltage in the dome light circuit is enough to give off a faint amount of light. If the resistor was higher then the voltage would not be enough to overcome it and light it up.
Last edited by DHCrocks; Nov 23, 2006 at 08:14 AM.
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yeh, the only reason i bought the superbrightleds was because they were cheap and i saw some pics that i liked.
velocityleds cost a lil more but i like them much better.
A+ for velocityleds.com from ahero
velocityleds cost a lil more but i like them much better.
A+ for velocityleds.com from ahero
Why do I bother to DIY???
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from Electrical point of view, just like what someone has said; it is their resistor value that has gone wrong..
However, I do have no problem with their LEDs (just LED, no integrated resistor); where I built my own circuit and layout and has run fine for almost a year now
However, I do have no problem with their LEDs (just LED, no integrated resistor); where I built my own circuit and layout and has run fine for almost a year now
