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Old 12-28-2009, 06:01 PM   #1
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Bulb within a bulb


Max overall length ~4", about 1" diameter, the bulb inside is about 2" x 3/8" inch, regular screw base, 120v, 150W.
What is this type bulb called?
I can't find a pic on the Web.

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Old 12-28-2009, 06:08 PM   #2
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Bulb within a bulb


http://www.gelighting.com/na/home_li...dison_main.htm
http://ecom.mysylvania.com/sylvaniab...0100%294080150


Last edited by jerryh3; 12-28-2009 at 06:15 PM.
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Old 12-28-2009, 06:54 PM   #3
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Bulb within a bulb


maybe this?

http://images.google.com/imgres?imgu...3D126%26um%3D1

most lamps have some sort of writing on them that indicates what it is. List everything printed on the lamp.

also, what kind of fixture does it go into? is there a ballast?
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Old 12-28-2009, 07:28 PM   #4
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Bulb within a bulb


Sound like a T-8 halogen bulb sorta use simuir on movie or therather equiment.

I did see it couple time before but you have to read the bulb codes it useally stamped on the base or on the end one of the two.

Merci,Marc
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Old 12-28-2009, 07:52 PM   #5
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Bulb within a bulb


It's most like Nap's photo, but the clear glass goes all the way to the base.
Both bulbs are burnt out, but the built-in lamp dimmer in the upright
http://ezdiyelectricity.com/images/p...iere-lamp1.jpg
is also zapped, so I may no-bid on this one. The manuf. probably wants more than the lamp is worth for a replacement dimmer.
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Old 12-28-2009, 08:09 PM   #6
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Bulb within a bulb




maybe?

it it seems the letters JTT are attached to every lamp I have found that has that configuration.
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Old 12-29-2009, 10:36 AM   #7
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Bulb within a bulb


Quote:
Originally Posted by nap View Post


maybe?

it it seems the letters JTT are attached to every lamp I have found that has that configuration.
That's exactly how it looks.

The lamp place says they don't have replacement dimmers so unless I can find a break in the wiring somewhere, this is a no-bid, no-fix.
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Old 12-29-2009, 10:41 AM   #8
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Bulb within a bulb


If it has a filament stretching from one end of the inner tube to the other, as in the picture above, then it is a halogen lamp (tungsten-halogen, a kind of incandescent).

Not to be confused with a "metal halide" lamp which is a kind of mercury vapor lamp, which has an inner tube with no filament inside, and which does require a ballast.

The inner tube gets hot enough that touching it and putting finger prints on it may result in melting and blowing up. The outer bulb prevents that and also distributes the heat better to reduce the chances of fire if a flammable object is nearby.

Needs no ballast; just screw it into an ordinary socket. (You did say 120 volts)
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Last edited by AllanJ; 12-29-2009 at 10:45 AM.
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Old 12-29-2009, 04:09 PM   #9
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Bulb within a bulb


Quote:
Originally Posted by AllanJ View Post
(You did say 120 volts)
Yes, and the unmarked reading lamp bulb on the gooseneck for this lamp reads 0.3 ohms cold. This has to be a 12v lamp, which is maybe why one of the dimmers has failed.

Lighting Masters supplied the lamp to the store in Rockville, MD, but they are yet another layer of companies between me and the people who made these dimmers.
Even if I could speak Chinese I doubt that I could get this part.

Last edited by Yoyizit; 12-29-2009 at 04:16 PM.
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Old 12-29-2009, 07:39 PM   #10
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Bulb within a bulb


I have never seen a 12 volt lighting system using medium screw bases.

So I believe that the lamp (the light bulb), despite the 0.3 ohm resistance when cold, is still a 120 volt lamp.

Just to be sure, you could connect the lamp directly (no dimmer circuitry) across the terminals of a car battery. If it glows normally brightly it is a 12 volt lamp.
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Old 01-02-2010, 10:16 AM   #11
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Bulb within a bulb


Quote:
Originally Posted by AllanJ View Post
I have never seen a 12 volt lighting system using medium screw bases.
Forgot to mention it has two pins.

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