Sylvania Metalarc CMI-T 70W/WDL 1pc Ceramic
When Philips launched the worlds first commercial ceramic metal halide lamps (CDM) at the end of 1994, this major innovation took the lighting industry by surprise. Fast-track projects were initiated at the major competitors to copy the new technology - which was possible thanks to a patent-interchange agreement between the principal lamp makers. GE was the second company to market its CMH lamps in the summer of 1997, followed by Osram's HCI later that year.

Sylvania was the fourth manufacturer to master the technology, and this Metalarc CMI lamp was unveiled at the Hanover Messe of 1997. It marked a radical step forward by shifting from the traditional five-piece ceramic arc tube to a highly innovative thin-walled shaped body, which has since become the standard among all major manufacturers, although Sylvania was about five years ahead in this development. Unlike its competitors, Sylvania was not tied down by having its own in-house raw ceramic materials production, and bypassed traditional ceramic shaping technologies by adopting the latest slip-cast moulding techniques, and fine-grain materials developed by Toto Ceramics of Japan. The result was this single-piece arc tube of considerably better dimensional consistency, having a very thin wall for increased output, faster run-up, increased transparency and better uniformity.

Like other competitors this lamp makes use of the patented Philips sealing technology - but in 1997 SLI Lighting was acquired by the US Chicago Miniature Lamp Company, with whom Philips did not have a cross-licensing agreement. The result was that this highly innovative lamp could most unfortunately no longer be brought to market.
Manufacturer: Sylvania Lighting International
Lamp Power: 70 Watts
Lamp Current: 0.98 Amps
Lamp Voltage: 90 Volts
Cap Type: G12 Ceramic + NPB pins
Bulb Type: T-19 T-6 in eighths/inch
Bulb Finish: Clear Quartz
Electrodes: Single Coil Thoriated tungsten
Arc Length: 7.0 mm
Atmosphere: Ar-Kr85|Dy-Ho-Tm-Tl-Na-Ix Outer: Hard Vacuum
Luminous Flux: 6,200 lm (@ 100h)
Luminous Efficacy: 88.6 lm/W (@ 100h)
Colour Temperature & CRI: CCT: 3000K CRI: Ra80+
Chromaticity Co-ordinates: CCx: 0.438 CCy: 0.397
Rated Lifetime: 6,000 hours (to L70F50)
Warm-up & Re-strike Time: 30 seconds (to 80% flux) <5 minutes
Burning Position: Universal
Nominal Length: 100 mm 4 inches
Light Centre Length: 56 mm 27/32 inches
Factory: Tienen Belgium
Date of Manufacture: 1997
Original Value: Engineering Sample
 
References: 1) Sylvania Neuheiten Magazine - Hannover Messe April 1997.