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Good call Sid, I was thinking of a basic one led + resistor circuit for a 12volt automotive application!
A 3v * 0.05ma would only be 0.15 watts, so the 20 LED bulbs would be 3 watts. And those are the dual circuit bulbs which function as brake lights. So the steady on position should be ~half or 1.5W, which is a 6.5 W drop across 4 bulbs. Savings of 26 watts/~2.2amps.
If I swap off the dual 5w plate lights to single led it would go down ~9 watts. Not sure if these would be bright enough, but i have some white LEDS and holders laying around.
The third brake light is a 18w 921 bulb, which I found a 6-3mm Led bulb that is a replacement. 0.020a * 3 volt = 0.06w, @ 6 leds + resistors round 0.5w compared to the 18w currently in place. ~17 watts saved
So looking at 26+9+17 = 52watts or 4.3amps. For the 90amp alt in the Subaru thats ~5% load just from the rear tail lights. Its obviously enough to make the idle change at cold morning runs, so I'm wondering if the minor gains would be worth it?
Not sure if that is worth the bulbs
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