GE Lucalox XO High Output Extra Long Life

In 2001-2 GE superseded its Lucalox HO High Output lamps by the XO range, with still higher performance. Both these classes of lamps feature high xenon pressure, to achieve increased luminous flux and maintenance, as well as longer life due to reduced loss of electrode and emitter materials.

The XO lamp replaced the former ignition antenna mounted on bi-metal strips with a track of cermet sintered into the arc tube surface - similar to the PIA design introduced by Philips in 1997. The antenna is always oriented in-line with the support frame to minimise shadowing. In an unusual move for GE, its tradtional external amalgam reservoir has also been eliminated, in favour internal amalgam but uniquely, located at only one end of the arc tube. An intentional cold spot has been created behind one electrode by applying a heat shield around the other. Deleterious reactions between amalgam and the seals are avoided by the similarly unique 2-piece ceramic arc tube - at the amalgam end the diameter has been reduced by a co-moulded end plug without any join. The niobium seal is made to a thin wire instead of the usual tube, which maintains a greater distance to the amalgam.

Less evident is the mechanically polished arc tube surface(see detail photo) which increases transmission. The ceramic is believed to be NGK's G-40 zirconium-doped alumina, which achieves superior sodium resistance and allows a life increase. The traditional barium getter of the outer bulb has also been replaced by a zirconium-iron alloy, having superior sorption for hydrogen. All together, these multiple design innovations make the Lucalox XO lamps some of the most reliable and highly performing lamps in their class.
Manufacturer: General Electric Company U.S.A.
Lamp Power: 70 Watts
Lamp Current: 0.98 Amps
Lamp Voltage: 90 Volts
Cap Type: E27s/27 Ni plated brass + vitrite
Bulb Type: TD-38 TD-12 in eighths/inch
Bulb Finish: Clear Soda-lime glass
Electrodes: Backwound Tungsten Ba2CaWO6 Emitter
Arc Length:
Atmosphere: Inner: Na,Hg | Xe Outer: Hard Vacuum
Luminous Flux: 6,600 lm (@ 100 hrs)
Luminous Efficacy: 94.3 lm/W (@ 100 hrs)
Colour Temperature & CRI: CCT: 2100K CRI: Ra 25
Chromaticity Co-ordinates: CCx: 0.530 CCy: 0.430
Rated Lifetime: 28,500 hours 50% survival, 78% flux
Warm-up & Re-strike Time: 5 minutes 4 minutes
Burning Position: Universal
Overall Length: 156 mm 6 5/32 inches
Light Centre Length: 102 mm 4 inches
Factory: Budapest Hungary
Date of Manufacture: May 2008 Date Code: 0506
Original Value: Unknown
 
References: 1) GE Lucalox XO Press Release Technical Presentation, October 2001.
2) GE Lucalox XO Brochure, December 2006.
3) GE Lucalox XO Technical Datasheet, September 2001.
4) GE Lucalox XO Technical Datasheet, September 2005.
5) GE Spectrum Lamp Catalogue, Europe 2008.
6) GE's Trio of Tweaks Pushes SON Forward, J.D. Hooker, Lighting Equipment News (UK), June 2004 pp.14-15.