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Osram Double Dulux Low Voltage 13W |
The double-tube lamps have voltages too high for stable operation in countries with 100-130V mains supplies, which required large and inefficient transformer ballasts. In 1985 Osram and Sylvania therefore introduced this low voltage design. It is based on the same discharge lengths as the single-tube 9W and 13W ratings, but folded again to halve its length. Due to a combination of the reduced discharge tube length plus operation at higher current its voltage is lower, and in fact the same as the single-tube types of same power - they therefore operate on the same ballasts. The same caps are also maintained, but the suffix code -2 is added to denote the wider dimensions of the base just above the lampholder interface. Incidentally, due to the high thermal loading of this 13W lamp, its U-bend is deeper than normal so as to lower the cold spot temperatre in the corners to keep the mercury vapour pressure optimum.
The low voltage double-tube lamps are about 5% less efficient than their high voltage European counterparts. For this reason they began to lose popularity as soon as electronic ballasts became popular, that development removing the upper limitations on discharge voltage and allowing the use of the more efficient European-style high voltage lamps in the Americas.
| Manufacturer: | Osram Corporation | |
| Lamp Power: | 13 Watts (@ 60Hz) | |
| Lamp Current: | 0.290 Amps (@ 60Hz) | |
| Lamp Voltage: | 56 Volts (@ 60Hz) | |
| Cap Type: | GX23-2 | PBT |
| Bulb Type: | T-12.4 | T-4 in eighths/inch |
| Bulb Finish: | CAT, LAP, YOX phosphors | Soda-lime glass |
| Electrodes: | Triple Coil Tungsten | Triple carbonate emitter |
| Atmosphere: | Argon + Hg | |
| Luminous Flux: | 860 lm @ 100h | |
| Luminous Efficacy: | 66.2 lm/W @ 100h | |
| Colour Temperature & CRI: | CCT: 3500K | CRI: Ra 85 |
| Chromaticity Co-ordinates: | CCx: 0.411 | CCy: 0.398 |
| Lifetime: | 10,000 hours | |
| Warm-up & Re-strike Time: | 2 minutes | Instant |
| Burning Position: | Universal | |
| Overall Length: | 123 mm | 47/8 inches |
| Lighted Area: | ||
| Mass: | ||
| Factory: | Maybrook, New York | U.S.A. |
| Date of Manufacture: | 1991 November | Date Code: uY5 |
| Original Value: | ||
