GE F48 Power Groove (full view)

This isn't a real fitting, rather just a what I'd guess you could call a 'test board' (but we're looking at the lamps, not what they're mounted on!)...

Shown here are 4 General Electric 4-foot VHO 'Power Groove' lamps (this view to show the whole length).
The 'grooves' are to provide more surface area so it gives more light (why the first groove has a long space I don't know)
These are 1500ma lamp current & 110w each.
They're also a fair bit heavier than a 'normal' lamp

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Filename:	4X48PG17.jpg
Album name:	XmasLightGuy / Fluorescent Lamps
Keywords:	F48PG17
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Date added:	22 Sep, 2015
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Comment 1 to 6 of 6

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Danny

[22 Sep, 2015 at 06:41 AM]

These are cool lamps

Andy

[22 Sep, 2015 at 09:47 AM]

I've always been fascinated with these lamps and although I've never actually seen one personally they look amazing! Would love to get hold of one though.

AngryHorse

[22 Sep, 2015 at 05:42 PM]

Smart glass working engineering, I think those groves are pressed in whilst the tube is still hot.

James

[22 Sep, 2015 at 10:13 PM]

Yes, the tube is heated on one side and then carbon moulds press in the grooves. Then rotate the tube and repeat on the other side. The long space creates a cold spot to lower the mercury pressure for optimum efficacy without having to use a long stem and reduced arc length to create a cold spot behinf

XmasLightGuy

[23 Sep, 2015 at 02:03 AM]

Thanks guys. Smile

I always thought these were cool, I consider it just luck that I found some at a reasonable price.
...
I believe T17's & PG17's were actually made up until last year (quite surprising considering how rare it is to even see one in use)
I guess the few remaining fittings/lanterns will eventually be doomed to the scrap bin (especially if T12 VHO lamps are eventually discontinued)

I'd love to see "the making of" for one of these!

XmasLightGuy

[23 Sep, 2015 at 02:26 AM]

...weird, it cuts your comment off if you type too much!
--
I figured there was some actual reason for the long space at one end.

Comment 1 to 6 of 6

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