Has anyone tried LED room lights? My sitting room needs a fairly bright central light - currently a 23W CFL lamp, equivalent to an old-style 100w bulb - but it's still a bit dim in the corners and takes a while to come on fully. I'm thinking of replacing it with something like a 25W LED lamp, allegedly equivalent to an old style 150W. What are they like in actual use? Do they have any annoying characteristics that would make them less pleasant than a CFL?