Hi Some time - check out what a “60 Hz” incandescent bulb looks like when hooked to 20 Hz …. flicker flicker flicker …
I suspect they optimize the thermal mass of the filament to reduce the flicker at 50/60 Hz. Bob > On Jan 18, 2016, at 3:45 PM, Poul-Henning Kamp <[email protected]> wrote: > > -------- > In message <29659871.S9XTlaFu4r@linux>, Bruce Griffiths writes: > >> To detect 100Hz modulation due to photocurrents in the LEDs the 150W >> incandescent bulb had to be placed within a few cm of the LEDs. > > Incandescent bulbs don't have much "hum" in their light output, > they're basically heating elements and they don't cool down nearly > fast enough. > > Try with fluorescent light instead, there's a reason people accuse > them of flickering. > > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > [email protected] | 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 -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
