Originally Posted by omni550
Do they still take a while to get to full brightness?
Yes, but not that long. It seems to be temperature related. The ones I have in outdoor fixtures take several minutes to get to full brightness when it's really cold out, although they are still perfectly usable as soon as switched on.
Indoors, the difference is much less, so although they do get a bit brighter within a minute or so, it's not that noticeable.