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Philips MasterColour Elite CDM-TC 35W/930 |
The original Elite lamps retained Philips' 5-piece cylindrical arc tube, but with dramatically reduced dimensions. The resulting increase in wall loading, which would normally destroy such a lamp, was enabled by the addition of 25-35% calcium iodide to the usual rare earth, sodium and thallium halide dose. This reduced the rate of corrosion of the ceramic arc tube. Meanwhile a trace of oxygen emanating from a calcium oxide dispenser initiated a tungsten-halogen cycle to prevent wall blackening and improve lumen maintenance. The smaller and hotter arc tube boosted the colour rendering index above 90, and luminous flux by about 7%, and it was originally claimed that Elite lamps could be dimmed to 60% of rated power and luminous flux. Unfortunately Elite was hampered by quality problems, and became better known as Delete after being withdrawn from sale for 2 years of redevelopment.
The re-launched Elite lamp featured here employs a novel injection-moulded 2-piece cylindrical arc tube, originally patented (but not used) by OsramSylvania. This allows the arc ends to be made much thinner, improving thermal uniformity, light extraction, efficacy, cold spot temperature and accelerating the run-up time and hot-restrike delay. This lamp delivered many of the original promises, notably an impressive boost in efficacy, life and colour rendering. However it is restricted to non-horizontal operation, and the dimming capability was removed - that feature not being re-introduced until the arrival of the Elite LightBoost lamp of 2010.
| Manufacturer: | Philips Lighting | |
| Lamp Power: | 39 Watts | |
| Lamp Current: | 0.53 Amps | |
| Lamp Voltage: | 85 Volts | 5 kV ignition pulse |
| Cap Type: | G8.5 | Quartz + Moly pins |
| Bulb Type: | T-15 | T-4¾ in eighths/inch |
| Bulb Finish: | Clear | UV-Stop Quartz |
| Electrodes: | Single Coil | Thoriated tungsten |
| Arc Length: | 4.3 mm | |
| Atmosphere: | ArKr85|Hg+(DyHoTmNaTlCa)Ix | Outer: Hard Vacuum |
| Luminous Flux: | 3,500 lm (@ 100h) | |
| Luminous Efficacy: | 89.7 lm/W (@ 100h) | |
| Colour Temperature & CRI: | CCT: 3000K | CRI: Ra=90+ |
| Chromaticity Co-ordinates: | CCx: 0.434 | CCy: 0.396 |
| Rated Lifetime: | 12,000 hours | (to L80F50) |
| Warm-up & Re-strike Time: | 3 minutes (to 90% flux) | <15 minutes |
| Burning Position: | Vertical ± 60° | |
| Nominal Length: | 85 mm | 43/8 inches |
| Light Centre Length: | 52 mm | 2 inches |
| Factory: | Turnhout | Belgium |
| Date of Manufacture: | 2007 August | Date Code: H7 |
| Original Value: | €64.00 (2008) | |
