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Philips Mixed Light ML 160W for Automatic Assembly |
Although all mercury lamps came under cost pressures as they neared obsolescence, self-ballasted types were severely affected because of the high degree of manual labour in their assembly. Whereas most manufacturers relocated production to low-wage countries, Philips redesigned its lamps to greatly reduce the labour cost element. Production was thereby retained a for few years longer in Europe.
The heart of new design centres around an automatic filament mounting mechanism, based on a glass bridge support similar to the type found in PAR38 incandescent reflector lamps. A high speed machine melts two sturdy wires into the ends of a glass rod, and five fine molybdenum support wires follow. This is welded in a single operation to the arc tube, resistor, getter pan and glass support stem, followed by automatic mounting of the filament. Previously a secondary getter was applied to the filament, but in this design a spot of red phosphorous is applied directly to the arc tube surface. That proved to be a notable drawback, because it was difficult to correctly control the getter quantity. Frequently far too much was applied, and the bulbs acquired a strong ginger colouration that reduced light output. Some customers were also troubled by the fact that the filament and arc tube centres were no longer aligned, compared to the earlier ML construction.
| Manufacturer: | Philips Lighting | |
| Lamp Power: | 160 Watts | |
| Lamp Current: | 0.67 Amps | |
| Lamp Voltage: | 235-245 Volts | |
| Cap: | B22d/25x26 | |
| Bulb Finish: | Clear | |
| Bulb Type: | E-70 | Soda-lime |
| Overall Length: | 165 mm | |
| Light Centre Length: | ||
| Electrodes: | Coiled-Coil backwound | Double carbonate emitter |
| Inner / Outer Atmosphere: | Inner: Ar | Hg | Outer: Nitrogen |
| Luminous Flux: | 3,000 lm (at 100 hours) | |
| Luminous Efficacy: | 18.8 lm/W (at 100 hours) | |
| Colour Temperature & CRI: | CCT: 3800K | CRI: Ra 60 |
| Chromaticity Co-ordinates: | CCx: 0.349 | CCy: 0.380 |
| Burning Position: | Horizontal | |
| Rated Life: | 6,000 hours (to 50% survival) | |
| Warm Up / Re-strike Time: | 4 minutes | 10 minutes max. |
| Factory: | Weert, The Netherlands | |
| Date of Manufacture: | July 2003 | |
| Original / Present Value: | No commercial value | |
