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The factory setup uses two 1157 bulbs for the parking/brake assembly. From what I have read online an 1157 bulb with a single filimant lit is 2.1amps and with both filaments illuminated it draws about 2.7 amps.
According to the original plastic panel for the taillight housing the bulbs put out 5 watts of light each.
So lets do some math here... remember theres 2 bulbs per housing...
parking lights = 8.4 amps
Brake lights = 10.8 amps
combined wattage= 20 watts
The led housings draw about .10 amps for the brightest mode.
so that is .4 amps...that is a 10.4 amp drop.
All i can find for light output is that they have "superior light output".
So they do make a drastic difference in power draw.
Also the nice thing is that instead of 4 amberish colored incandescent bulbs shining through a white difuser and a red lense these are 40 super bright leds shining thorugh a clear red lens
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