Incandescent lamps also have the property of a cold resistance very much lower than that at design voltage. Used in series with drills and bathroom fans this gives a useful current surge at switch-on.
And the [time-nuts] connection? I use a torch bulb in series with the drive to a dry cell powered slave clock. High initial current pulse dropping to a lower holding current over the half second activation period. Needs careful selection of lamp voltage and current. Regards, John Howell. On 11 Oct 2011, at 23:23, Neville Michie wrote: > Incandescent light bulbs are very useful. > They are a high dissipation resistor with a lot of uses. > I have one in series with a bathroom ceiling fan, just kept plugging smaller > watt values in > until the fan was quiet enough but still fully functional. > I have one in series with a micro drill press, runs with full revs but stops > when the drill jams. > It will be a pity to see them turn to unobtainium. > cheers, > Neville Michie > > > > > > > On 12/10/2011, at 9:05 AM, Mark Sims wrote: > >> >> I now have my house converted over completely to LED bulbs... over 300 of >> them (mostly PAR16/PAR20/PAR30/PAR38 bulbs)! At retail the cost would have >> been over $15,000 dollars!!! Totally insane... I have a large closet >> totally dedicated to light bulbs. When incandecents/halogens are no >> longer made I'll sell all the ones that I have removed and become stinkin' >> rich. >> >> Then I found an Ebay seller that was selling "used" bulbs for dirt cheap >> (like <$5 for a PAR20 and $10 for a PAR30... actually less than the >> halogens cost). They are apparently store/utility company returns (Bubba >> buys a replacement bulb and can't figure out how to install it so returns it >> to the store). I was replacing a couple incandecent bulbs every week (many >> times they killed a $35 dimmer when they blew). Only one of the LED bulbs >> has failed in the last year. >> >> I did have to build 32 custom fixtures to replace the 900 lumen/50 watt/12V >> halogen MR-16 bulbs. The brightest MR-16 LED bulb available is around 300 >> lumens. >> >> If you use PAR20 bulbs in your house check out: >> http://www.ebay.com/sch/new_life_electronics/m.html?_nkw=led&_trkparms=65%253A15%257C66%253A1%257C39%253A1&rt=nc&_trksid=p3911.c0.m14.l1513&_pgn=1 >> These are some of the best PAR20 bulbs out there and the lots of 10 usually >> go for less than $60. The exact same bulbs sell for $40 each a Lowes. >> >> >> _______________________________________________ >> 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. _______________________________________________ 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.
