LED lighting on the upswing....

[Wombat]

A problem with flourescent lights is that I can see 60Hz. I can visibly see the refresh of a 60Hz CRT, and up to ~75Hz or so I can feel eye strain. Much the same with flourescent lights, unless there are many of them.

[az]

I can understand that concern, and sometimes this bugs me too (although they flicker at every half-wave, so 120 Hz in the US, this is still perceptible out of the corner of the eye for some, including me). That's why I wrote about good fluorescent lights. Those have electronic ballasts, which switch at 20-50 kHz. You can buy these electronic ballasts for your T12 or T8 fluorescent tubes (other advantages are: no humming, even better efficiency, smaller than electromechanical ballasts, instant start, no need for a starter, longer tube life, autodetection of defective lamps, thus no tubes constantly switching on and off, and some expensive models are dimmable), and modern CFLs should have these built-in. Due to the long life of fluorescent lamps (and because people are cheap), there might still be a lot of fluoros out there with electromechanical ballasts.

Most people don't know about electronic ballasts because they aren't advertised to domestic users (and aren't sold in ordinary stores here), but many businesses or schools etc. use these (because it pays off in the long term when there are hundreds of tubes active).