Return to the thumbnail page Display/hide file information See previous file See next file

GEC Low pressure Sodium lamps

GEC Low pressure Sodium lamps

Click to view full size image

This is almost the 1980's GEC sodium lamp range. There are a couple of rogue OSRAMs in there! I know there are a lot of GEC fans out there but I must admit to preferring the finer details of the Philips range back then.

soh45b.jpg spectralHg.jpg gec_1.jpg black_light_40w.jpg

Light Information

Light Information

Manufacturer:GEC / Osram
Lamp
Lamp Type:SOX, SLI
Electrical
Wattage:10, 18, 35, 55, 60, 90, 135, 180, & 200W

File information

File information

Download: Download this File
Filename:gec_1.jpg
Album name:tuopeek / Low Pressure Lamps
Rating (1 votes):
Keywords:Lamps
File Size:135 KB
Date added:Jun 11, 2011
Dimensions:2000 x 778 pixels
Displayed:355 times
Date Time:2011:06:11 10:50:10
DateTime Original:2011:06:11 10:37:24
Exposure Bias:0 EV
Exposure Time:1/60 sec
FNumber:f 2.8
Flash:Flash, Auto-Mode
Focal length:6.7 mm
ISO:100
Make:FUJIFILM
Model:FinePix S5500
Software:Adobe Photoshop Elements 2.0
White Balance:0
URL:https://www.lighting-gallery.net/gallery/displayimage.php?pos=-55496
Favorites:Add to Favorites
Comments
rjluna2
Sr. Member
****
Offline

Gender: Male
Posts: 290
View Gallery

Robert


GoL
View Profile Personal Message (Offline)
Jun 11, 2011 at 06:42 AM Author: rjluna2
That is a quite of collection of SOX and SLI you have there including the King of Kings SLI wattage

Pretty, please no more Chinese failure.

tuopeek
Newbie
*
Offline

Posts: 5
View Gallery

GLS on Tesla Coil


tuopeek 111967450636623837217 tuopeek1 77334065@N05/
View Profile WWW Personal Message (Offline)
Jun 11, 2011 at 07:03 AM Author: tuopeek
thanks rjuna2, the 200W SLI is a recent buy through eBay. It was not cheap, but I could pick it up as it was not far away. They look a bit fragile for posting. I think they have more if anyone is interested.
AngryHorse
Sr. Member
****
Offline

Gender: Male
Posts: 366
View Gallery

Rich


View Profile Personal Message (Offline)
Sep 21, 2012 at 02:21 AM Author: AngryHorse
Perfect collection , mine is minus the 10watt and the 60watt linear though

Current: UK 230V, 50Hz
Power provider: e.on energy
Street lighting in our town: Philips UniStreet LED

"Beauty fades, dumb is forever".......Judge Judy Cheesy

dor123
Hero Member
*****
Offline

Gender: Male
Posts: 2537
View Gallery
Other loves are computers, office equipment, A/Cs


View Profile WWW Personal Message (Offline)
Sep 21, 2012 at 02:29 AM Author: dor123
Why the 180W SOX, is much larger than the 200W SLI, if the SOX is single ended and the SLI is double ended?
A single ended U tube should be smaller than a linear tube in a similar wattage. This is the target of the CFLs: U tubes are more compact than linear tubes.

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.

tuopeek
Newbie
*
Offline

Posts: 5
View Gallery

GLS on Tesla Coil


tuopeek 111967450636623837217 tuopeek1 77334065@N05/
View Profile WWW Personal Message (Offline)
Sep 21, 2012 at 03:36 PM Author: tuopeek
LinearSLI/H: My 18w and 135w SOX are not true old GECs but I was lucky to find the 10W

Dor123: Good question, I am not absolutely sure but it’s to do with current density in the gas. From what I can find out in an old book I have, the tube shape and neon-argon pressure result in a higher voltage per unit length compared to SOX lamps. The light output is also a bit higher for the more efficient 180W SOX than the 200W SLI/H
LegacyLighting
Jr. Member
**
Offline

Posts: 99
View Gallery

Blake


View Profile WWW Personal Message (Offline)
Sep 21, 2012 at 05:14 PM Author: LegacyLighting
What a great collection of LPS lamps. You've got pretty much the whole range there!!
tuopeek
Newbie
*
Offline

Posts: 5
View Gallery

GLS on Tesla Coil


tuopeek 111967450636623837217 tuopeek1 77334065@N05/
View Profile WWW Personal Message (Offline)
Sep 22, 2012 at 10:37 AM Author: tuopeek
thanks Brisluminous, almost




Posts:
View Gallery

View Profile Email
Sep 30, 2012 at 07:26 AM Author:
Nice collection you have here. The SLIs are definitely a nice presence!

Dor - The reason why the U-shaped burner of the 180W SOX is much longer than the linear discharge tube inside the 200W SLI has to do with a large difference in power density in their respective sodium discharges. As you have certainly noticed, the SLI burner has a non-circular cross section aimed at improving the light extraction of sodium's optically-thick radiation (which mostly occurs in a thin discharge layer located at the wall).

The other advantage of such burner geometry lies in its larger surface-to-volume ratio, which results in a significantly higher rate of charge loss from the discharge compared to that in the straight cylindrical burner of SOX lamps. The enhanced rate of electron and ion losses in the SLI discharge lead to a much higher plasma E field strength since more ionization is needed to compensate for the higher losses. This higher field magnitude logically results in more power being dissipated per unit length than inside the SOX burner, hence resulting in such a large difference in geometry and size.

Interestingly, the burner shape and the gas fill mixtures are optimized in such a way that NA’s optical extraction is optimized (less resonant absorption) while the discharge efficiency remains as high as possible. The last part is very important because driving low-pressure sodium discharges at increasingly higher loads results in a decreasing efficiency – a trend known since the 40s and 50s when highly-loaded mercury fluorescent tubes were first develloped (does “Power-Groove” rings a bell? ). The cause of this decreasing efficiency is the excitation of Na (or Hg in fluorescent tubes) at higher energy levels which results in the stronger emission of other spectral lines at the expense of the all important resonant emission. By raising the discharge’s E field, these burners of non-circular cross section (clover leaf, power twist, power groove …) not only raise the power load, they also affect the mean energy of electrons in the discharge in such a way that this offsets the excitation of the metal vapor more toward the atom’s lowest energy levels, thus permitting an efficient conversion of electrical energy to resonant optical emission. This therefore ensures a high lamp efficiency (at least a far less severed efficiency decrease) at higher power loads …

In straight tubular burners, the electron energy can be affected only by changing the nature and pressure of the fill gas, which leaves far less room for efficiency adjustments at high power loads. It therefore results SOX lamps must operate at a limited power load, which is the reason for their long discharge tubes – and one of the reasons why the higher efficiency of SOX-E lamps is achieved thanks to an even lower power density of their sodium discharge.
AngryHorse
Sr. Member
****
Offline

Gender: Male
Posts: 366
View Gallery

Rich


View Profile Personal Message (Offline)
Sep 05, 2019 at 02:25 PM Author: AngryHorse
I can’t believe I commented on these in 2012, and didn’t notice your 180!!! , stunning collection too mate

Current: UK 230V, 50Hz
Power provider: e.on energy
Street lighting in our town: Philips UniStreet LED

"Beauty fades, dumb is forever".......Judge Judy Cheesy

© 2005-2019 Lighting-Gallery.net | Powered by: Coppermine Photo Gallery