Hi The shutter on a conventional movie projector is very much an on / off device. They run well below 120Hz. The phosphors in a white LED are at least as long persistence as those in a TV set. There are a *lot* of TV's out there that refresh at 60 Hz or less.
Bob -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Poul-Henning Kamp Sent: Tuesday, September 18, 2012 9:05 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Hi Power LED Light power supply... In message <ac9e4c92327746d4a521facd35d9d...@vectron.com>, "Bob Camp" writes: >I suspect those same 120Hz sensitive people would not be able to watch TV or >a movie :).... I suggest you either carry out a couple of experiments yourself, or go a little easy on the irony. CRTs, and LCDs go out of their way to avoid flickering using physical or electronic persistence, whereas a naked LED wil happily flash up to several hundred kHz if you ask it to. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
