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Sylvania SPX EcoArc Unsaturated Sodium Retrofit |
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) | |
