Oddly enough I have several times had a dead (common) bulb in a trouble
light, suddenly flash, then keep working again. Juat a freak
occurrance, I guess, that the filament welded itself. I dont remember
the details, but I do recall one bulb that lasted a very long time
Those "Marconi bulbs" remind me of toaster coils inside of a glass
envelope. They're cool looking though. The filaments in them must be
rated for a much higher voltage than 120V, because they burn rather dim,
yet they do put out a fair amount of light. Kind of like wiring two
standard bulbs in series. They do light, but are dim. They would
probably last forever at half voltage.
I've fitted four metal bodied table lamps in our home with "touch
dimmers". They make it much easier to control the lamps than having to
reach up under the lampshade to twist the socket switch when using a
"3-way" bulb. And, a single 150 watt incandescent is much cheaper than a
50/100/150 watt 3-way bulb.
But, as I learned early on, when a bulb filament finally blows the
"tungsten arc" which accompanies the "final flash" can draw a current
surge great enough to blow out the dimmer.
I solved the problem by installing fuse holders with 2 amp quick blow
fuses in each lamp. Now, when a bulb blows with an arc it takes out an
easy to replace 15 cent fuse rather than a $10 wired in dimmer.
Another interesting "effect" of having those touch dimmers in the lamps
is that during the part of the fall season when a few lady bugs move
into our home, occasionally one of them will crawl up to the top edge of
the brass bulb socket and walk around it. The tiny creature is probably
seeking the heat from the lit bulb. If its legs touch both the socket
and the bulb base the dimmer gets tripped. and the lamp changes
intensity or turns off. I know I could put some sort of an insulator
around the top of the bulb socket to prevent that but it happens so
seldom I haven't bothered.
How come some people can turn on a computer, find Usenet, install Agent
and subscribe to a news group while having an IQ around their shoe size?
Been using CFL for 7 years, most lamps are not crap. I have 4 23 watters
outside for security that run dusk to dawn. Installed 4 in 2008, replaced
one a month ago. I've replaced a total of 6 inside out of 12 in 7 years.
Not crap by anyone's standards even though they are overrated for
longevity I'm satified.
Flat panel computer monitors have been using CCFL backlight since they
In most light bulbs where ratio of watts to filament length (before
uncoiling) is around or over 20 watts per inch, the bulb is filled with a
mixture of argon and nitrogen. I heard on one web site, 93% argon 7%
In most with lower ratio of watts to apparently visible before-uncoiling
length, the bulb has a vacuum.
- Don Klipstein ( email@example.com)
You don't need a kit, just a couple of things found in any well equipped
household; namely, a gas torch and vacuum pump.
Just use the torch to heat an area of the bulb to the point of softness,
make a hole in it, remove dead filament and insert new, use pump to suck out
as much air as possible (makes the filament last longer) while sealing hole
with a syrupy glass rod. Learn to do it well and you'll soon have a nice
little business servicing your friends and neighbors,
If you swap the polarity you convert them into dark suckers. They quit
putting light in the room and suck the dark out of the room. Similar to
revresing the flow in a heat pump and making it into a cold pump to heat and
cool a house.
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