What is it??

[rlundsrud]

This was given to me about 5 years ago. The curious thing about it is the thickness of the glass. The only marking on it is the number 01 molded in the glass just above the base. In 30+ years in the trades I have never see another one like it. I feel certain its not an antique but I really don't know how old it is. I would really appreciate it if someone could satiate my curiosity on this.


Thanks

 

[rlundsrud]

...and the first person that says its a light bulb is off my Christmas list

 

[LarryFine]

Looks like a rough-service bulb. Does the surface feel rubbery?

 

[petersonra]

I agree with a previous poster. It is probably a rough service bulb. Usually the only real difference is the filiment is stronger and better supported. Some of them are coated with plastic to make them shatter resistent too.

 

[ptonsparky]

RS. They were the go to bulb for those Trouble Lamp cords we used while under the hoods of cars that were leaking fuel in a normal mode of Operation. IIRC they didn’t burn the skin as badly as the standard 100 watt.

 

[mbrooke]

Sylvania Halogen capsulite bulb.

 

[mbrooke]

Here is an early version:

Sylvania Capsylite High Efficacy with Diode Rectifier

Latter version:

Sylvania 18970 100A/HAL 120V Light Bulb - Buy 100 watt - 120 volt - A19 - Medium Screw (E26) Base - 2,950K - Frosted - A-Line - Daylight Plus - Capsylite | Sylvania Halogen Incandescent Light Bulb Online at ServiceLighting.com

Sylvania 18970 100A/HAL 120V Light Bulb - Buy 100 watt - 120 volt - A19 - Medium Screw (E26) Base - 2,950K - Frosted - A-Line - Daylight Plus - Capsylite | Sylvania Halogen Incandescent Light Bulb Online at ServiceLighting.com - More than 50,000 light bulbs and accessories available online!

www.servicelighting.com

These were sold up until the early 2000s in hardware stores and home centers that carried Sylvania.

There is no vacuum in these bulbs that I know of, you can literally pry the screw shell off.

 

[sameguy]

Here is an early version:

Sylvania Capsylite High Efficacy with Diode Rectifier

Latter version:

Sylvania 18970 100A/HAL 120V Light Bulb - Buy 100 watt - 120 volt - A19 - Medium Screw (E26) Base - 2,950K - Frosted - A-Line - Daylight Plus - Capsylite | Sylvania Halogen Incandescent Light Bulb Online at ServiceLighting.com

Sylvania 18970 100A/HAL 120V Light Bulb - Buy 100 watt - 120 volt - A19 - Medium Screw (E26) Base - 2,950K - Frosted - A-Line - Daylight Plus - Capsylite | Sylvania Halogen Incandescent Light Bulb Online at ServiceLighting.com - More than 50,000 light bulbs and accessories available online!

www.servicelighting.com

These were sold up until the early 2000s in hardware stores and home centers that carried Sylvania.

There is no vacuum in these bulbs that I know of, you can literally pry the screw shell off.

How would the filament not burn out? Unless it is a lamp inside a lamp (capsulite).

 

[480sparky]

...and the first person that says its a light bulb is off my Christmas list

It's a Dark Sucker.

 

[mbrooke]

How would the filament not burn out? Unless it is a lamp inside a lamp (capsulite).

Halogen Capsule.

 

[Frank DuVal]

IIRC they didn’t burn the skin as badly as the standard 100 watt.

Well, as long as you used the 50 or 60 watt version.... Only fools ever used 100 watt lamps in trouble lights. They could melt carpet!

 

[mbrooke]

Well, as long as you used the 50 or 60 watt version.... Only fools ever used 100 watt lamps in trouble lights. They could melt carpet!

I've used 200 and 300 in my living room. I'm not kidding.

 

[GoldDigger]

Halogen Capsule.

The inner capsule is a standard quartz halogen bulb. The protective outside shell served two (maybe 3 if you count light diffusion) purposes.
It blocked the UV radiation that came through the quartz capsule unimpeded. Notice that quartz capsule luminaires always have a glass filter, even when they only give indirect light.
The second is to contain the potential hot sharp fragments when the quartz capsule occasionally explodes.

 

[rlundsrud]

Why did they make the glass so thick. It must be at least 1/2 thick throughout. It is incredibly heavy. I cant imagine what the price point on these must have been.

And why no manufacturers markings or watt rating info on it?

 

[rlundsrud]

Here is an early version:

Sylvania Capsylite High Efficacy with Diode Rectifier

Latter version:

Sylvania 18970 100A/HAL 120V Light Bulb - Buy 100 watt - 120 volt - A19 - Medium Screw (E26) Base - 2,950K - Frosted - A-Line - Daylight Plus - Capsylite | Sylvania Halogen Incandescent Light Bulb Online at ServiceLighting.com

Sylvania 18970 100A/HAL 120V Light Bulb - Buy 100 watt - 120 volt - A19 - Medium Screw (E26) Base - 2,950K - Frosted - A-Line - Daylight Plus - Capsylite | Sylvania Halogen Incandescent Light Bulb Online at ServiceLighting.com - More than 50,000 light bulbs and accessories available online!

www.servicelighting.com

These were sold up until the early 2000s in hardware stores and home centers that carried Sylvania.

There is no vacuum in these bulbs that I know of, you can literally pry the screw shell off.

The later version is definitely it, i wonder why i have never seen one before this.

 

[hbiss]

The later version is definitely it, i wonder why i have never seen one before this.

I had to think about it too until mbrook identified it. Now I remember. They made a brief appearance and weren't very popular. Apparently they are still available?

-Hal

 

[GoldDigger]

They are marginally more energy efficient that standard incandescent, enough that manufacturing and selling them is still permitted. And you cannot beat that CRI of 100. (Duh, compared to tungsten of course)

 

[richardelectric]

It's a Dark Sucker.