So, sure, I don't need light often in the garage but it's hard to predict. It would be nice to install a long-life bulb and forget about it, as I've done indoors.
Given your description why not just stick with whatever incandescent bulb wattage that gets the job done. There are still some out there which will provide 10,000-hour life, even in cold weather and/or exposed to the elements.
... the childless delusion that I'm doing my part to reduce energy.
Perhaps the solution would be to have kids.
(You might wish to change 'childless' to 'childish'.)
