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Standard HPS vs high CRI HPS

Standard HPS vs high CRI HPS

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Here's a comparasion between a Sylvania Lumalux 70w HPS lamp and a Philips 100w Ceramalux Comfort HPS lamp. Can you spot the difference and which one is the Comfort?

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Filename:image~511.jpg
Album name:silverliner / high pressure sodium
Keywords:Lamps
File Size:148 KB
Date added:Jan 06, 2015
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dor123
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Jan 06, 2015 at 10:48 PM Author: dor123
The comfort is in the left lantern, and have a whiter light.

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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Jan 07, 2015 at 06:05 AM Author: streetlight98
Comfort on the right with the whiter light?

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dor123
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Jan 07, 2015 at 06:13 AM Author: dor123
Oops. I'm confused. The right is the comfort, not the left. As the right have whiter light than the left.

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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Jan 07, 2015 at 03:02 PM Author: Silverliner
Correct, the one the right is the Ceramalux Comfort. It has a more natural looking light than the pastey color of the conventional HPS. Good eye!

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Jan 07, 2015 at 04:22 PM Author: streetlight98
Ah so the light really is a better quality? I was thinking it would only be a minimal change, but looking at the pic, there seems to be quite a difference. How do they make the CRI and color temperperature higher? I'm guessing these cost more and have less lumens? (although with greater CRI, these lamps may appear just as bright or brighter than a standard HPS if the standard HPS is rated for lumens, as a new 100W /DX MV appears much brighter than a 50W HPS and both are rated for 4000 lumens)

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Jan 07, 2015 at 04:35 PM Author: FrontSideBus
With SON-DL your talking about CRI65 which is better than some halophosphor fluorescents! Normal SON is like CRI20...

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Jan 07, 2015 at 04:50 PM Author: Silverliner
Both still are at 2200K, but the difference in color appearance can be like comparing a halophosphor warm white with a deluxe warm white or /830. The higher CRI is simply achieved by a higher operating pressure. I noticed the arc length is shorter than a conventional HPS lamp.

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Jan 07, 2015 at 05:16 PM Author: streetlight98
Interesting. That makes sense. I'm interested in tracking one those down now! Are they still made? I think Jace has a GE version of this, or was his Philips too?

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Jan 07, 2015 at 06:46 PM Author: Silverliner
The seller who I got this lamp from still has more. Look for southernvintagelight.

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Jan 07, 2015 at 07:50 PM Author: streetlight98
Ah thanks Dave.

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Feb 08, 2015 at 04:51 PM Author:
@Silverliner: "I noticed the arc length is shorter than a conventional HPS lamp." - that's a good observation Dave, and the reason for this shorter electrode gap distance is the higher discharge electric field caused by the elevated metal vapor pressure. So, in order to keep the lamp voltage constant for a proper ballast compatibility, one has to reduce the discharge length. Interestingly, a little known fact is that the increased discharge power density that results from the shorted electrode gap causes the plasma temperature to rise, and this enhances the blue-green emission from sodium vapor. This critically contributes in maintaining a high lumen efficacy despite the enhanced light absorption caused by the higher sodium vapor pressure in the lamp.

I also got one of those nice little Ceramalux 100W/Comfort - I wonder if they saw a widespread use in the USA. Deluxe HPS lamps look like more niche products there than in Europe.
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Jul 31, 2016 at 04:52 PM Author: LandryB
I have a couple GE LU70/DX. I really like the color of those compared to standard HPS. Also had a couple of these in floodlights at work. They failed after a couple of years due to sodium leakage.
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Aug 01, 2016 at 01:56 PM Author: AngryHorse
The one on the right almost looks Cosmo!

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Aug 01, 2016 at 02:00 PM Author: wattMaster
Can you get the same effect with a 150 Watt HPS on 250 Watt ballast?

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Aug 01, 2016 at 02:03 PM Author: Lumex120
Where can you get high CRI HPS lamps?

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Aug 01, 2016 at 06:50 PM Author: streetlight98
@ WattMaster: Sure, but you'll kill the lamp very fast and it might possibly fail violently!

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Aug 01, 2016 at 07:12 PM Author: wattMaster
So I shouldn't try it.

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Aug 01, 2016 at 08:25 PM Author: streetlight98
I wouldn't recommend it. 50W on 70W maybe or 70W on 100W but I wouldn't try any more of a difference than that. And even then, you'll kill the lamp early on.

To resist is to piss in the wind, anyone who does will end up smelling.

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