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GE F48PG17/CWX Cool White Deluxe Powergroove

GE F48PG17/CWX Cool White Deluxe Powergroove

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I have a pair of these NOS inside etchers.

PC300017.JPG PC300001.JPG PC300007.JPG PC300009.JPG

Light Information

Light Information

Manufacturer:GE
Model Reference:F48PG17/CWX
Lamp
Lamp Type:Fluorescent
Base:Recessed Double Contact
Shape/Finish:PG17
Service Life:7500 hours
Electrical
Wattage:110w
Current:1500ma
Optical
Lumen Output:5175
Color Temperature:4200K
Color Rendering Index:87
Physical/Production
Dimensions:48 nominal inches
Factory Location:Circleville, OH USA
Fabrication Date:1964

File information

File information

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Filename:PC300007.JPG
Album name:silverliner / Fluorescent - T-12 and larger
Keywords:Lamps
File Size:57 KB
Date added:Mar 07, 2010
Dimensions:1024 x 768 pixels
Displayed:412 times
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DieselNut
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John


jonathon.graves johng917 GeorgiaJohn
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Mar 08, 2010 at 08:38 AM Author: DieselNut
Sweet!!

Preheat Fluorescents forever!
I love diesel engines, rural/farm life and vintage lighting!

NiMo
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Mar 15, 2010 at 09:13 PM Author: NiMo
Well golly geewillikers! I wonder where you got them from??

Group Replacement, Baby

Silverliner
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Verd a ray classic.


GoL
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Mar 15, 2010 at 10:16 PM Author: Silverliner
LOL, I forgot where I got them...just kidding! Thanks for the nice lamps!

May all the great lighting technologies have their place in history.

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Silverliner
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Verd a ray classic.


GoL
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Oct 01, 2015 at 03:45 PM Author: Silverliner
UPDATE: I lit these on an 800mA ballast recently. Beautiful lamps, even at about half the output. But they have the WORST phosphor distribution I've ever seen! The grooves causes the coating to have ugly dark streaks and so on!

May all the great lighting technologies have their place in history.

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vytautas_lamps
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My idol is Mylene Farmer, deal with it.


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Apr 06, 2019 at 09:32 AM Author: vytautas_lamps
So there was a power twist, a power groove. Was there any other power-indequitive-shape tubes ever made? Or was those two only?
(yes I am aware that there were tubes in USA made with phosphor on the inside cleared out in spiral and ring shapes to let out the brighter phosphor light from the inside of the tube, but those doesn't count)

New lighting technologies is a pity fest everywhere you look. From LEDs that last only for two months, to a never-ending global starvation of t8 fluorescent tubes.
We shall reinforce ourselves with good old full mercury t12s and HIDs made to surpass one's life, and give them all the middle finger ;

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Apr 06, 2019 at 02:41 PM Author: James
Good question Vytautus! In fact there was, the first shape used to improve the output was a squashed tube, to make a kind of oval cross-section. But this made the glass quite weak it could only be used on short T5 tubes. During the 1940s and 50s GE made many trials to try and apply the same principles to the most popular 40W 4ft T12 tubes, but they tended to implode on the vacuum pumps. The problem was taken up by Gene Lemmers, and his solution was the predecessor of the PowerGroove - which had the grooves on only one side. The combination of C-shaped grooves, moulded in short sections instead of one long groove running the whole tube length, made the glass strong enough to survive vacuum-pumping without shattering. Within a year or two he made a further improvement together with the other PowerGroove co-inventor John Aicher, to mould the groves alternately on both sides of the tube, which brought a further improvement in the lumen output for a given tube length.
vytautas_lamps
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Apr 06, 2019 at 02:46 PM Author: vytautas_lamps

Good question Vytautus! In fact there was, the first shape used to improve the output was a squashed tube, to make a kind of oval cross-section. But this made the glass quite weak it could only be used on short T5 tubes. During the 1940s and 50s GE made many trials to try and apply the same principles to the most popular 40W 4ft T12 tubes, but they tended to implode on the vacuum pumps. The problem was taken up by Eugene Lemmers, and his solution was the predecessor of the PowerGroove - which had the grooves on only one side. The combination of C-shaped grooves, moulded in short sections instead of one long groove running the whole tube length, made the glass strong enough to survive vacuum-pumping without shattering. Within a year or two a further improvement was made, to mould the groves alternately on both sides of the tube, which brought a further improvement in the lumen output for a given tube length.

WOW! I never knew that! Oval squashed tube?! I wonder how that would look like in a t12 or t8 Thank you very much for informative answer

New lighting technologies is a pity fest everywhere you look. From LEDs that last only for two months, to a never-ending global starvation of t8 fluorescent tubes.
We shall reinforce ourselves with good old full mercury t12s and HIDs made to surpass one's life, and give them all the middle finger ;

James
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Apr 06, 2019 at 02:49 PM Author: James
If you click the hyperlink in my post above you can see an example of one of the flattened tubes. Or see US Patent 2,482,421
Silverliner
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GoL
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Apr 06, 2019 at 04:01 PM Author: Silverliner
Knew about the flattish T5s GE briefly made in the 1940s. I know someone who has one. 4w I think.

May all the great lighting technologies have their place in history.

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