While I'm all for energy efficient light bulbs, I've never been fond of those spiral compact fluorescents. The shape is often wrong for a fixture, and the color temperature is too cold and blue, and you really don't want to have to look at them. But the LED bulbs that are starting to be available are much better: the shape and size is pretty close to an old-style incandescent bulb, the color is warmer, they go on instantly, and they're dimmable. [They are, however, exceedingly spendy up front.]
I flipped on my office desk task light this morning, and poof! The incandescent bulb expired. When he got in, the building manager scrounged me up an 8 watt LED bulb made by Philips. Lovely!
But...it didn't work. You see, the light fixture is a wall mounted, adjustable, spring arm fancy-pants thing by Tolomeo.
And as soon as I put the bulb in, it gently sank down and rested its little head on my telephone.
The problem is that the old incandescent bulb (A) weighs about an ounce, and the new bulb (B) weighs 4.4 ounces - way too heavy for that particular fixture. Happily we had some old style bulbs, but what are we going to do when we can't get them anymore? In all the hullabaloo about the phase out of incandescent bulbs, it never occurred to me that we might need to get new light fixtures.