All my lights are CF Ls
now except for the flood lamps outside the front and garage doors.
They all come on instantly but at a lower output then build up to full brightness - I don't find this a problem as the light is sufficient to enter and navigate a room and by the time I'm ready to do anything that needs full light, they've come up to "speed".
I've had a couple of instances with dual switch set ups where the light would give a regular weak flicker after being turned off. We discovered that it only happened if you turned off the lights in a particular way (like if switch A was down and B was up (light on) and you switched B down to turn the light off it would flicker but if you switched the light off by switching A up it wouldn't flicker).
I actually like the "warm up" period of CF Ls
- I can turn on the light after my eyes have adjusted to the dark and I don't get blinded. By the time the light's warmed up to full glow, my eyes have adjusted to it.
We've got a mix of "cold" white and "warmer" more incandescent-like CF Ls
. I don't mind the cold white as I find it easier for reading - I find it near impossible to read a book by incandescent light. Even a very powerful incandescent (over 100W). A 60W-equivalent CFL is fine to read by.