Can anyone explain about those energy efficient light bulbs?

[truth2power]

Ok. I couldn't get an answer at my local hdw store.

What's the difference in these...

1. Bulbs with a twisty element. Kinda looks like a creamy whip. I have 2 of these in my bathroom. First I've bought and I really like them. They don't come on instantly and at first they're quite dim, but they brighten up in about 15 seconds. Two 40 watters that use I think about 18W each.

2. Same as above except that the element is 3 or 4 upright loops. Is there any advantage/disadvantage to these as opposed to #1? What's the difference?

3. These have a separate base and I guess you just replace the element but use the same base? How are these different?

I'd use these bulbs throughout my home if I could make an informed decision as to which to get.

Help / links would be appreciated. thanks.

[IronLionZion]

1. This link may help a bit.

http://www.servicelighting.com/library/compact_fluorescent_light_bulbs.cfm