Easier said than done in some cases. If you have lamps that use a shade that clamps over the bulb, they don’t work with cfl’s. The cfl’s seem to be not as bright as its incandescent equivalent. You can go higher though since the wattage is so reduced.
The biggest problem though is finding reliable cfls that are dimmable and I haven’t seen any for 42 watt range equal to the 150 incandescent that we use in our computer room. The 100 isn’t really bright enough.
If you read reviews at sites people complain about the bulbs going bad too fast for the prices paid and you have to be careful if you get the wrong bulb it will cast a bluish light or with the led a greenish light. ick
The manufacturers of inkjet cartridges furnish packaging to send them back for recycling. Why not require twisty bulb manufacturers to do the same.