hmmm-the dimmable ones sound like they have some improvements
Our Compact Fluorescents use Amalgam rather than Liquid Mercury. Our Compact Fluorescent's use amalgam for three very important reasons:

1) This allows all of our Compact Fluorescent's to be used in totally enclosed fixtures.

2) The use of amalgam eliminates the environmental concern regarding disposal of Compact Fluorescent's. The mercury used in the lamps is entirely contained inside the almalgam alloy and does not escape when the lamp is destroyed or disposed of. This makes the lamp safer to handle than conventional Compact Fluorescents.

3) Amalgam technology maintains light output in extreme temperatures.