Re: Light bulb keep on burning out

hallerb@xxxxxxx wrote:

On Mar 18, 7:27�pm, Jeff Wisnia <jwis...@xxxxxxxxxxxxxx> wrote:

Don Klipstein wrote:

In article <frbmid$ei...@xxxxxxxx>, dpb wrote:

scott21...@xxxxxxxxx wrote:

Perhaps that particular light fixture is turned on and off a lot. �If
that's the case, the only light bulb that will alst is a LED type
(which aren't widely available yet and don't come in high enough
wattages to be useful yet).

A 130V or heavy-duty design bulb will almost certainly solve the problem
unless there is an actual problem in the fixture or circuit itself
(which we can't tell from here).

� 130V, superlonglife and inductrial/shock/vibration duty incandescents
also produce less light for the amount of electricity consumed than
"standard" incandescents, generally 15-25% less. �Use CFLs where you can.

�- Don Klipstein (d...@xxxxxxxxx)

This thread got me to wondering what kind of light bulbs are used in
traffic signals (pre the LED ones, of course.)

Seems like there's certainly a lot of "ons" and offs" in those
applications, particularly when they are set to "blink mode".

Can you clue me in about that Don?

Come to think of it, when I was a kid there were advertising signs all
over the place which had huge numbers of incandescents constantly
blinking on and off.

Maybe that kind of cycling doesn't shorten the life of an incandescent
bulb as much as some people might think, huh?

Jeff

--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
The speed of light is 1.8*10^12 furlongs per fortnight.- Hide quoted text -

- Show quoted text -


older traffic light bulbs were special heavy duty lamps run at a
slightly lower voltage. have seen the bulbs, they were big on
mechanical strength.

traffic lights have tough lives, vibration from passing trucks,
impacts, extreme weather, etc etc.

a fellow who fixed them said voltage didnt just snap off and on, it
ramped up and was never completely off, which backed up a lamp
assembly i saw one nite, it had opened somehow and the off color
positions were glowing very slightly. would f never been seen with the
colored glass in place


I doubt that they could "ramp" the current very easily back in the pre-solid state electronics days. But maybe they just used resistors across the switch contacts on the one you saw? That would keep the filament warmer during the "off" periods.

And, the electricity "wasted" that way was MUCH cheaper in those good 'ol days.

Jeff
--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
The speed of light is 1.8*10^12 furlongs per fortnight.


note the newer LED lamps, when they fail area go out, rather than the
entire lamp


not long ago I saw a hanging traffic lamp broken from its mount,
spinning in the wind. big storm going on

I called 911 immediately if that fell thru a windshield someone could
get hurt bad. a hour or two later i passed the intersection on the way
home the lamp assembly was gone.

the tech must of hated me, he had to do that in a severe storm



.

Relevant Pages

  • Re: how on earth do I remove this screwless glass ceiling light dome?
    ... and I need to change my ceiling light bulb before then ... here's how my domed ceiling lamp looks like:http://img6.imageshack.us/img6/2015/lampfv.jpg ... Even if you somehow figure out how to open that fixture, ...
    (alt.home.repair)
  • Re: Poll (& me being boring)
    ... After a few more minutes I realised something was dripping again so I got up (bedside light once more) and saw there was a wet patch. ... After some investigation I realised the drips were coming from the overhead light bulb. ... However, it would have worked *only* if the original problem was insufficient contact between the lamp and the frame -- as opposed to a bad contact within the lamp, which is what the problem had looked like until I made my connection discovery. ...
    (uk.rec.humour)
  • Re: Limiting current, w/wall wart txformer?
    ... solution for limiting current is the LER light emitting resistor, aka incandescent lamp, light bulb, bulb, bub etc. ... Measuring the current in the circuit with the lamp on, will confirm that the circuit current falls within the desired level. ... I remember when I was young and living in the US, early teens, replacing the ES fuses with ES light bulbs and watching the change in illumination with load. ...
    (rec.crafts.metalworking)
  • Re: Light bulb keep on burning out
    ... the only light bulb that will alst is a LED type ... superlonglife and inductrial/shock/vibration duty incandescents ...
    (alt.home.repair)
  • Re: New woodworking idea?
    ... For the willow lamp shade, I peeled the bark off of some willow branches, ... The second example of a rustic lamp shade was made from a birch "tube". ... especially if you put a colored light bulb in it for an accent lamp. ...
    (rec.woodworking)