I replaced all of my incandescents ten years ago with CFLs.  I get 6 packs at Lowes or Home Despot for $8-10, and can sometimes get them for a dollar each.

Take the equivalent wattage with a grain of salt.  The most common 13 Watt ones are too dim for most table lamps-I use 18 and 23 Watt.

I use them in regular fixtures-I find that many fixtures that take the rung or U shaped tubes tend to put out a harsh bluish light and the replacements cost  $5 or more.  I got reflective inserts for my ceiling cans that increase the available light.

As far as mercury goes, there is about 4 mg per bulb.

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