Bob K. Posted October 9, 2018 #1 Posted October 9, 2018 I installed a Kriss Starlight Driving Light Module years ago. It's designed to dim driving lights so that one can use high wattage bulbs and not blind oncoming traffic. I used it for years with standard halogen bulbs in my Motolights. I recently switched to LED bulbs (550 lumens, 7watts each). They run at full power just fine, but they don't dim. Instead, they wig-wag back and forth just like police lights. Anyone face the same thing and have a solution?
djh3 Posted October 10, 2018 #2 Posted October 10, 2018 HID can not be used with a modulator. LED take a different modulator than the old school for halogens. Check out KRISS or any of the folks that have modulators for headlights.
Bob K. Posted October 10, 2018 Author #3 Posted October 10, 2018 HID can not be used with a modulator. LED take a different modulator than the old school for halogens. Check out KRISS or any of the folks that have modulators for headlights. The Kriss Starlight Driving Light Module controls and dims my Motolight driving lights, not my headlight. It's designed to dim, no modulate. I have a Signal Dynamics module filling that function.
Flyinfool Posted October 10, 2018 #4 Posted October 10, 2018 Most LED headlights / driving lights are not dimable. The Actual LED element runs off of around 3.5 volts. So there is a voltage regulator built into each bulb to take your 12V and drop it down to the 3.5 that the LED needs. If you lower the input voltage from 12V with a dimmer, the regulator will maintain the 3.5 to the LED as long as you have more than about 5 volts input. If you drop to less than the threshold of the regulator, it will most likely just turn off. You need LEDs that are designed to be dimable.
Bob K. Posted October 10, 2018 Author #5 Posted October 10, 2018 The LEDs bulbs I purchased are advertised as 12v-only dimmable bulbs.
Flyinfool Posted October 11, 2018 #6 Posted October 11, 2018 Do you know if your dimmer uses PWM or voltage reduction for the dimming?
Bob K. Posted October 11, 2018 Author #7 Posted October 11, 2018 Good question! No, I don't. I'll check for that.
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