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post #2 of (permalink) Old 9th November 2006
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I think it's simply a case that the normal 10/21W tail/stop light bulb is the easiest way of putting a bulb of the necessary brightness in the holder. 21W single filliament bulbs are readily available (for indicators, rear fogs etc.) but 10W bulbs are usually of a different design and even the bayonet ones have a much smaller cap. So this approach makes sense for a few reasons, not least of which is that you don't have to carry so many different types of spare bulb. You can also swap bulbs between the boot and main clusters if only the brake light filliament has failed.

By the way, there's something in the law somewhere about rear fog and brake light separation - designers aren't allowed to put them right next to each other. That's why the brake light filliaments aren't used in the boot mounted holders.
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