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Philips SDW-AR 22W Replica

Philips SDW-AR 22W Replica

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This lamp is a replica of Max's original Philips SDW-AR 35W Crown Silver White SON lamp, which I made by hand a few weeks ago. Its arc tube is extracted from a 35W SDW-T lamp and is not optimised for the heat reflection from the mirrored bulb, which it has been found varies significantly depending on the precise position of the arc tube. This is not well controlled with ordinary GLS lampmaking techniques but is critical for SDW lamps, and is maybe one reason why reflector types were never launched for sale. This particular lamp is best operated at 22W to deliver the correct spectrum - see Power Curves

To try and get closer to the original performance, I will look out for some cheap American SDW-LV lamps with low voltage arc tubes and make another lamp. Perhaps then the additional heat provision from the mirror would bring the arc voltage closer to the level of the European lamps and then it might not run too hot on the correct 35W ballast.

The photos also show one of the early applications of these lamps, which were extensively trialled by Philips for retail display lighting in the early 1980s.

youtube_BAg7J4dzEnc.jpg D SHP Philips SDWR50.jpg D SHP Philips SDWAR22.jpg D SHP Philips SDWAR22 powercurves.jpg

Light Information

Light Information

Manufacturer:James
Model Reference:SDW-AR 22W
Lamp
Lamp Type:Sodium High Pressure
Filament/Radiator Type:Philips SDW-T 35W arc tube
Base:E27/27
Shape/Finish:PS-60
Electrical
Wattage:22 W
Voltage:102 V
Current:0.28 A
Optical
Lumen Output:550 lm
Lumen Efficacy:27.5 lm/W
Color Temperature:2500K
Color Rendering Index:80
Physical/Production
Dimensions:104.5mm x 60mm
Factory Location:Belgium
Fabrication Date:Arc tube : 1986. Outer jacket : November 2018
Application/Use:Retail display lighting

File information

File information

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Filename:D SHP Philips SDWAR22.jpg
Album name:James / Sodium High Pressure
Rating (2 votes):
Keywords:Lamps
File Size:386 KB
Date added:Dec 03, 2018
Dimensions:1798 x 2464 pixels
Displayed:182 times
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Comments
rjluna2
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Robert


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Dec 03, 2018 at 06:42 AM Author: rjluna2
Nice custom made, James

I don't know, but I would suggest that you try to make this envelope with longer neck to fit into the arc tube better

Pretty, please no more Chinese failure.

Max
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Dec 03, 2018 at 11:17 AM Author: Max
Wow... that's very nicely done James, this is a good evidence of your skills as a master lamp craftsman! It would be quite difficult to identify this lamp as a replica if you had not actually mentioned it. I can spot a few tiny details that depart from my lamp though (i.e., the stem, the thickness of the lead wires, the round getter dispensers, the the slightly fatter burner, the end cap... told you this would end up as a game of finding the five differences lol), but apart from that this really is an outstanding piece of work, especially with what is left at your workplace - congrats
Silverliner
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Verd a ray classic.


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Dec 04, 2018 at 06:47 PM Author: Silverliner
Awesome job James, it looks pretty professionally made!

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

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Feb 02, 2019 at 03:45 PM Author: Powergroove
Wow. That's an amazing lamp you made. Truly deserving of five stars.

Keep government out of the lighting industry.

Alex
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Mit dem Osten Siegen!


Alex_lightning jurgenneandertal
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Apr 16, 2019 at 03:46 AM Author: Alex
Is it possible to make a replica of thane

Lamp and Valve collector

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Preserving the Brightest Ideas of Our Age


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May 02, 2019 at 06:04 PM Author: Globe Collector
I saw you put this up on your site James.....and it rightly deserves pride of place there!

This is really spectacular and I have to agree with all above.

Max is correct about your ever shrinking access to the gear that makes this type of work possible. I would find that infuriatingly frustrating to a head-banging degree!

This is the nearest thing to the "Boogie Globe" I imagined as a child....if it had a P28s cap then it would fit that childhood fantasy almost precisely.

Equally fascinating is the great sensitivity of the arc tube to its environment and the significant reduction of input power achieved simply by changing the outer bulb geometry.

Do you know of any cases where this technique of power reduction made it through to fully commercialized lamps?

Manufactured articles should be made to be used, not made to be sold!

Fee, Fye, Fow, Fum, A dead man's eye and a parrot's BUM!

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