Sylvania SPX EcoArc Unsaturated Sodium Retrofit

SPX EcoArc lamps were introduced in 1998 to offer a performance upgrade vs Sylvania's ULX / SHX Penning-start retrofits for mercury lamps. Those suffered relatively short lifetime owing to their rapid voltage rise during life, and despite the improvement in efficacy above mercury lamps, this was limited owing to the losses associated with the neon-argon fill that was necessary for easy ignition.

Sodium lamps can save energy on mercury ballasts due to their reduced power factor, and the shape of the ballast curve allows further savings by operating at either lower or higher lamp voltages. Most HPS retrofits use lower voltage to allow for voltage rise during life, however the SPX lamps were the first to shift to higher voltages up to 165V, made possible thanks to the their novel arc tube which operates in the mercury-unsaturated and sodium-saturated regime. The amalgam dose is considerably reduced, such that all the mercury and virtually all of the sodium is vaporised when in operation. Such lamps are characterised by a stable voltage through life, which permits the unusually high voltage.

The arc tube is xenon-filled for high efficacy and starting is facilitated by an ignition antenna, biased by a glowbottle in this low wattage lamp, or by an FEC + Sidac ignitor in the base of the larger versions. To limit the rate of sodium loss, the arc tube is made of NGK's superior G-40 ceramic, and the electrode emitter is Sylvania's low-reactivity BSY2 mix. The range originally comprised 98W, 190W and 295W ratings to replace 125W, 250W and 400W mercury. Following a design tweak to limit the voltage peaks during run-up, this smallest model was re-rated to 69/108W in 2001, so as to replace both 80W and 125W mercury lamps.
Manufacturer: Havells-Sylvania
Lamp Power: 69 / 108 Watts
Lamp Current: 0.82 / 1.20 Amps
Lamp Voltage: 100 / 120 Volts
Cap Type: B22d/25x26 Ni plated brass + vitrite
Bulb Type: E-75 E-23½ in eighths/inch
Bulb Finish: Clear Soda-lime glass
Electrodes: Backwound Tungsten BSY2 BaSr(Y2O4)2 emitter
Arc Length: 52 mm 2.05 inches
Atmosphere: Hg-Na3.4% | Xe 25 torr Outer: Hard Vacuum
Luminous Flux: 4300 / 8800 lm (@ 100 hrs)
Luminous Efficacy: 62.3 / 81.5 lm/W (@ 100 hrs)
Colour Temperature & CRI: CCT: 1800 / 1900 K CRI: Ra 22
Chromaticity Co-ordinates: CCx: 0.535 CCy: 0.404
Rated Lifetime: 24,000 hours 100% flux & 50% survival
Warm-up & Re-strike Time: 2 minutes 5 minutes
Burning Position: Universal
Overall Length: 176 mm 6 15/16 inches
Light Centre Length: 110 mm 4 3/8 inches
Factory: Tienen Belgium
Date of Manufacture: April 2009 Date Code: 40
Original Value: €44.00 (2010)
References: 1) SLI Sylvania Brochure SPX EcoArc Lamps, 1999
2) Havells-Sylvania Lamp Catalogue, 2008/2009
3) Havells-Sylvania Prijspocket, 2010/2011
4) SPX EcoArc : A New Concept for Energy Reduction, R.Geens, J.Cox, C.Vlekken, LS:8 Int. Symp. on Sci. & Tech. of Light Sources, Greifswald, 1998
5) Progress in HPS Lamp Technology, R.Geens & E.F.Wyner, IEE Proceedings-A Vol.140 No.6 Nov.1993 pp.450-464
6) New Emissive Materials for USV Sodium Lamps, D.Goodman & R.Snellgrove, LS:7 Int. Symp. on Sci. & Tech. of Light Sources, Kyoto, 1995
7) Characteristics of Unsaturated HPS Lamps on Mercury Ballasts, J.Ravi & G.M.F.Luijks, IES Conference, San Diego, 1992