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Osram Dulux-S 7W Compact Fluorescent |
Rather than copying the exact Philips design, Osram introduced some technical variations in an effort to reduce the cost of these lamps. Most notably it opted for a U-bend instead of the glass bridge technique. In an effort to still create something of a cold spot to decrease mercury vapour pressure and enhance efficacy to similar levels as the Philips lamps, the glass is blown into a mould having squared corners rather than a rounded bend as applied on higher wattage fluorescent lamps. The extreme outer corners of the bend serve as the cold spot, and became known as 'cold ears' when translated from their German name.
Osram also simplified the method of end sealing by eliminating several manufacturing steps. Whereas Philips applied a miniaturised glass stem-mount assembly as used on larger lamps, created by two separate seling operations, Osram was first to introduce the technique of pinch-sealing both ends of the discharge tube simultaneously to a bead-mount assembly, as used in the manufacture of miniature incandescent lamps. This is visible in the X-Ray image.
As such Osram became a cost leader in compact fluorescent, and established the design that was most copied by later competitors. It suffered a minor compromise in efficacy at higher ambient temperatures due to its slightly warmer cold spot temperature vs the Philips concept, but this was neither known nor of any real significance to most customers.
| Manufacturer: | Osram GmbH | |
| Lamp Power: | 7 Watts | |
| Lamp Current: | 0.175 Amps | |
| Lamp Voltage: | 45 Volts | |
| Cap Type: | G23 | Aluminium + 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: | 400 lm @ 100h | |
| Luminous Efficacy: | 57 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: | 137 mm | 53/8 inches |
| Lighted Area: | 100 x 27 x 12 mm | 4 x 11/16 x 1/2 inches |
| Mass: | ||
| Factory: | Augsburg | Germany |
| Date of Manufacture: | 1983 October | Date Code: rN4 |
| Original Value: | ||
