A mate at work pointed out yesterday that only 1 of the bulbs in my tail light was on. Having taken them out to check them today, it seems theyre both twin filament bulbs, but, like the headlights, only use 1 filament on either bulb (so the 5w is on on one of them as a tail light, and the 25w comes on on the other when you pull the brakes). Is that normal, and if so, is there a known mod to use both filaments on both bulbs, like there is on the headlight?