[time-nuts] the end of light bulbs as we know it was Re: Safe power-up. was (Solartron 7075 ...)

John Howell j at howell61.f9.co.uk
Tue Oct 11 19:20:59 EDT 2011


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.
>> 
>> 		 	   		
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