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Lustra 18w Low Pressure Sodium Luminaire

Lustra 18w Low Pressure Sodium Luminaire

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The LPS mini wallpack lit with a Philips powertone SOX-E18 lamp. The fixture draws 50watts (!) with this lamp.

125wRegent-MV_IMG_5585.jpg 125wRegent-MV_lit.jpg IMG_2454-Lustra-Wallpack.jpg IMG_2357-18wSoxWallpack.jpg

Light Information

Light Information

Manufacturer:Lustra Lighting
Model Reference:LI0082-400
Lamp
Lamp Type:Low Pressure Sodium
Fixture
Fixture Type:18W Low Pressure Luminaire
Ballast Type:Advance 71A9467
Electrical
Wattage:18w (50w consumption)
Voltage:120
Current:1.0 (1.06 amps measured mean)
Physical/Production
Factory Location:East Rutherford, NJ
Fabrication Date:1984

File information

File information

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Filename:IMG_2454-Lustra-Wallpack.jpg
Album name:lights*plus / Original Fixtures
Keywords:Lanterns
File Size:975 KB
Date added:Feb 13, 2016
Dimensions:1800 x 1200 pixels
Displayed:274 times
URL:https://www.lighting-gallery.net/gallery/displayimage.php?pos=-116821
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themaritimegirl
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Feb 13, 2016 at 12:37 PM Author: themaritimegirl
There's another member here with a magnetic 18W LPS fixture that draws that much power. I thought his ballast was going bad, but evidently it's normal. I don't understand why, though.

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Ash
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Feb 13, 2016 at 12:51 PM Author: Ash
50W That is unreasonable. Sure its not 50VA ?
dor123
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Feb 13, 2016 at 12:58 PM Author: dor123
If the lamp draws much more than its rated wattage, it is overdriven, so it won't last long.

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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Feb 13, 2016 at 01:16 PM Author: Ash
The lamp probably is driven at 18W, but 30W losses on a 18W ballast, even if it is autotransformer ? sorta hard to believe
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Feb 13, 2016 at 02:10 PM Author: themaritimegirl
No, he measured it correctly - see in the details, he measured the line current to be 1.06A, which would translate to 127 VA. These ballasts are just incredibly inefficient, and I don't get why. Completely defeats the extra efficiency that comes with using an LPS lamp.

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Ash
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Feb 13, 2016 at 02:37 PM Author: Ash
How on Earth they are made so ineficient ? It would be a challenge to do even on purpose, unless materials other than copper for the coil are allowed...

And. What is the arc voltage of this thing ? Couldnt it work with a choke on 120V ?
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Feb 13, 2016 at 02:37 PM Author: lights*plus
Yea I thought maybe tops 35watts draw, but 49 watts for the mean of five lamps, it really is an oxymoron! Would like to remove the ballast & put a WH3 or similar, so I'd get real 18w draw.
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Feb 13, 2016 at 02:45 PM Author: themaritimegirl
Ash, I also thought an 18W sox lamp should work fine on a 120V choke, but another member who tried it couldn't get his lamp to strike. If I recall correctly, he didn't have any starters to try with, though (to wire across the lamp, to allow for an inductive kick to start the lamp). Got the equipment to give that a try, George? A 14/15/20 choke would do the trick.

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Feb 13, 2016 at 03:01 PM Author: lights*plus
@TheMaritimeMan: I would wire the SOX lamp just like a fluorescent? If yes, no problems. I'd also use my photographer's light meter to see how it drives the lamp.
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Feb 13, 2016 at 03:37 PM Author: themaritimegirl
Yep, just wire the lamp in series with the ballast. If it doesn't start try putting an ordinary starter across the lamp. Your average 14/15/20 ballast will underdrive an 18W lamp a bit, but an F25T12 ballast like the Advance LC-25 should be perfect.

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Feb 18, 2016 at 04:41 AM Author: lights*plus
Look HERE
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Feb 20, 2016 at 03:31 AM Author: yuandrew
I noticed your's does not have the mounting provisions on the raised part behind the lampholder for a photocontrol (see my 50 watt HPS version before I converted it to 18 watt SOX)
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Feb 20, 2016 at 02:41 PM Author: lights*plus
Hmm, Something I completely overlooked. What junk! It's going to be a b*tch to try and drill a photocontrol hole for it. Don't know why they'd sell it like this, and don't know what the price was in 1984 for it. Probably as overpriced as it was a few weeks ago....
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