Osram Dulux-D/E 13W Compact Fluorescent
In 1984 a huge miniaturisation of compact fluorescent lamps was achieved by mounting a pair of U-tubes side-by-side, to create the Sylvania double-tube design. From the single-tube range of 5, 7, 9 and 13W a double-tube family of 10, 13, 18 and 26W was created. There was no 22W double created from the 11W single, because its length and high voltage would preclude operation even on 220-240V mains. Osram followed in 1985 with the introduction of its Dulux D lamps, and Philips in 1986 with its PLC family.

In 1986 Osram made a further breakthrough by modifying its lamps for use on electronic ballasts, as was already being applied for its higher power Dulux L types. High frequency operation results in increased efficacy by reducing the lamp voltage for a given luminous flux. It also extends electrode life by starting lamps more softly, avoids irritating flicker during operation as well as when starting, and facilitates dimming and emergency battery operation. For many years Philips maintained that electronic ballasts were far too expensive to conquer the CFL market, but Osram had a different vision and was first to market with this technology.

The 2-pin cap is replaced by a 4-pin variant for controlled preheating of both electrodes, and the internal glowbottle starter is eliminated. The empty rectangular base post was not removed because it was found to be necessary for mechanical stability when lamps are used horizontally, but its length is reduced slightly. Incidentally, the nominal power ratings of the 4-pin lamps are the same as their 2-pin equivalents. This holds true when they are used on magnetic ballasts with an external starter, but at high frequency the actual power may be lower, depending on the ballast type.
Manufacturer: Osram GmbH
Lamp Power: 13 Watts (@ 50Hz) 12.7 Watts (@ HF)
Lamp Current: 0.170 Amps (@ 50Hz) 0.165 Amps (@ HF)
Lamp Voltage: 100 Volts (@ 50Hz) 77 Volts (@ HF)
Cap Type: G24q-1 PBT
Bulb Type: T-12.4 T-4 in eighths/inch
Bulb Finish: Y2O3:Eu3+, CeMgAl11O19:Tb3+ Soda-lime glass
Electrodes: Triple Coil Tungsten Triple carbonate emitter
Atmosphere: Argon + Hg
Luminous Flux: 900 lm @ 100h
Luminous Efficacy: 69.2 lm/W @ 100h
Colour Temperature & CRI: CCT: 2700K CRI: Ra 81
Chromaticity Co-ordinates: CCx: 0.460 CCy: 0.414
Lifetime: 5000 hours
Warm-up & Re-strike Time: 2 minutes Instant
Burning Position: Universal
Overall Length: 153 mm 6 inches
Lighted Area:
Mass:
Factory: Ansan South Korea
Date of Manufacture: 1991 Q2 Date Code: Iz8
Original Value: GB £7.54 (1992)
References: 1) Osram Lamp Catalogue 1989/90 Germany p.4-08
2) Osram Price List 1992 UK p.4-05