One thing to considered is bulb efficiency.  I do not have data here to
support it but when I was looking into making a brighter light for a
friends bike I found the following.  The more current I pushed though the

light, the more efficient it was (light output vs current input) but
would burn out much faster.  The less current, the efficiently dropped
quickly but would last longer.  There were some web sites that supported
this.

If you just used a resister you would loss power in two places.  In the
resister as heat and in the bulb as heat also (less energy into light and

more into heat.)


Of course I could be wrong about the whole thing.

Tom

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