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K-HICA White Sodium with Shaped PCA |
The 50W White SON is primarily employed in directional spotlighting in shops and other commercial interiors, and differing burning positions can yield a change in luminous flux and colour properties of the lamp. The result is that spotlights aimed at different angles can have very slightly differing colours of light, and this is considered unacceptable to many Japanese lighting designers.
Colour stability is precisely controlled by a special transformer-ballast circuit which is required for all lamps of this type, to maintain lamp current within very tight tolerances. However it is very difficult to make a ballast which can automatically compensate for changes in burning position, and prevent variations in light colour.
This particular lamp attempts to address the problem by employing a special moulded arc tube body manufactured by NGK Insulator company of Japan, which has tapered end chambers and a larger diameter bulged central portion. This design naturally offers a far greater thermal uniformity around the arc tube than is found in plain tubular versions. The result is that when burning position of the lamp is changed, there is less overall change in arc tube temperature distribution. Consequently National's K-HICA lamps deliver better far better colour uniformity among a group of spotlights aimed at different angles.
| Manufacturer: | Matsushita Electric Works Ltd. | |
| Lamp Power: | 50 Watts | |
| Lamp Current: | 1.45 Amps | |
| Lamp Voltage: | 45 Volts | |
| Cap Type: | E26s/25 | Ni plated brass + porcelain |
| Bulb Finish: | Clear | Borosilicate glass |
| Bulb Type: | T-30.5 | T-9½ in eighths/inch |
| Overall Length: | 124 mm | 6 inches |
| Light Centre Length: | 86 mm | 4 5/8 inches |
| Arc Length: | ||
| Electrodes: | Backwound Tungsten | Barium Calcium Tungstate |
| Atmosphere: | Na,Hg | Xe 300 torr | Outer: Hard Vacuum |
| Luminous Flux: | 2,300 lm | @ 100 hours |
| Luminous Efficacy: | 46.0 lm/W | @ 100 hours |
| Colour Temperature & CRI: | CCT: 2500K | CRI: Ra 92 |
| Chromaticity Co-ordinates: | CCx: | CCy: |
| Burning Position: | Universal | |
| Rated Lifetime: | 6,000 hours | to 50% survival |
| Warm-up & Re-strike Time: | 5 minutes | 15 minutes max. |
| Factory: | Osaka | Japan |
| Date of Manufacture: | Circa 1985 | |
| Original & Present Value: | ¥10,800 (2002) | £61.01 (2005) |