On an interesting but unrelated note, if you undervoltage halogens far
enough, their efficiency drops to something really shocking (forget about
battery power), and their life expectancy drops significantly too. (that's
why
dimmers on home downlights is a stupid idea).

After all that, you can see why I stuck to halogens.

--
Linux Registered User # 302622
http://counter.li.org

I sort of suspected as much. I often wondered if there was much point to a
dimmer. A second lower wattage bulb would probably be more efficient.

Marty