> LED flicker can be noticeable well above 250Hz in some conditions

I've got LED displays refreshed at 300Hz and that they aren't
static is obvious if you move your head or roll your eyes. Refresh
at higher frequency would still be noticeable as LEDs have no
persistence

Joe
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.