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Philips 50w HPS phosphored

Philips 50w HPS phosphored

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Finally have another one of these fine lamps. Interestingly, it has the same date code as the last one. The first one had an excellent long life and also came with a Lights of America HPS fixture. The coating glows pink under black light so it appears to be an actual phosphor.

Flicker Flame+.JPG F6T5-D comparison+.jpg Philips 50w-D-med+.jpg Ott Magnetic Spiral 13w+.jpg

Light Information

Light Information

Manufacturer:Philips
Model Reference:C50S68/D/M
Lamp
Lamp Type:High pressure sodium
Base:E26 medium
Shape/Finish:ED17
Service Life:24,000 hrs rated
Fixture
Ballast Type:S68
Electrical
Wattage:50
Voltage:52
Optical
Lumen Output:4000
Color Temperature:2100K
Color Rendering Index:22
Physical/Production
Factory Location:USA
Fabrication Date:October 1991
Application/Use:Lamp collection

File information

File information

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Filename:Philips 50w-D-med+.jpg
Album name:arcblue / Bulbs in captivity
Keywords:Lamps
File Size:140 KB
Date added:Sep 04, 2017
Dimensions:1008 x 662 pixels
Displayed:110 times
URL:https://www.lighting-gallery.net/gallery/displayimage.php?pos=-137269
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ace100w120v
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Sep 04, 2017 at 09:02 PM Author: ace100w120v
Interesting! Does the phosphor actually really contribute much when fully run-up? I thought HPS didn't really produce much UV?
arcblue
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Sep 05, 2017 at 12:11 AM Author: arcblue
No, the phosphor does nothing to affect color on an HPS lamp. My guess is the bulbs were made on the same equipment as their mercury lamps to save money, and they just stuck the HPS innards in them once the bulbs were formed and coated.

I'm lampin...

dor123
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Sep 05, 2017 at 03:06 AM Author: dor123
The phosphor red color, can be easily seen during run-up, especially if the lamp is well aged: http://www.lighting-gallery.net/gallery/displayimage.php?pos=-135511 (The left lantern)
Animated spectrum: http://www.lighting-gallery.net/gallery/displayimage.php?pos=-136589

I"m don't speak English well, and rely on online translating to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

I only working with the European date format (dd.mm.yyyy).

I lives in Israel, which is a 230-240V, 50hz country.

Lightingguy1994
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Dec 30, 2017 at 11:36 PM Author: Lightingguy1994
Dor123, don't HPS lamps in your side of the world use Neon as a buffer gas? I thought I read somewhere that they did.

As for this phosphor coated HPS specimen, if it ever becomes a mercury only burning lamp when it gets near EOL, it will have a more coated MV colour
dor123
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Dec 31, 2017 at 04:46 AM Author: dor123
This isn't a non cycling unsaturated HPS lamp.
We don't have neon buffered HPS lamps. HPS lamps are usually buffered with xenon. The neon ones, are the ones that are designed to retrofit MV lamps in their ballasts, but they aren't exists here in Israel.
The lamps in the picture, are 70W HPS lamps with an internal glow starter, operating on 70W HPS ballast.

I"m don't speak English well, and rely on online translating to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

I only working with the European date format (dd.mm.yyyy).

I lives in Israel, which is a 230-240V, 50hz country.

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