OK, this could be the most mundane fucking thing I've ever written.
Being a bit of a tree hugger, I've been buying those little fluorescent lights. They cost more, but they last a hell of a lot longer and use a quarter of the power to make the same light.
Truth be told, I just got tired of replacing light bulbs, especially on the outside and where I often have one on, like the living room or over the stove. I swear that one of the pair of lights at my front door is always burned out. Well not anymore, because this time they went within three days of each other and I put the mini's in there.
My initial objection to those was that the color temperature was all fucked up and, well, fluorescent. As it turns out though, they seem to be about the same as normal bulbs.
And I did the math, and I'll use less electricity, which means lightening my portion of the power burden, and just barely break even in terms of paying for the bulb. (Like I'm worried about power consumption given recent purchases.)