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MR16 with Facetted Dichroic Reflector Lamp - ENL |
The original lamps had specular reflectors and it was sometimes found that undesirable images of the filament would be projected in the beam, leading to a non-uniformity of the illuminated area. A solution was proposed in a 1965 patent of Sylvania, with their invention of the 'Peened Reflector'. That had small spherical depressions in its surface to introduce a controlled level of diffusion - but it also caused a notable decrease in reflection efficacy, and the glasworking tools were very difficult to produce.
A still more effective solution was invented by Emmet Wiley in 1975, with the concept of what the "Multi-Mirror" reflector featured here. The surface is divided into around 300 keystone-shaped facets, each having a flat surface and therefore being easy to machine. Moreover the sharp angles of the peened reflectors were eliminated, which achieved not only reduced optical diffusion losses for a higher light output, but also less wear and a longer tool life.
The ENL model was one of ten multi-mirror types introduced in 1975. It was originally intended for fibre optic lighting applications, and as such has a longer life than other more highly loaded projection types. Beginning in the early 1980s the multifacetted dichroic lamps became popular among lighting designers because of their elegant and glittering appearance. They experimented with versions like this long-life ENL, and within a few years the MR16 lamp began to transition into general display lighting applications.
| Manufacturer: | General Electric Co. U.S.A. | |
| Lamp Power: | 50 Watts | |
| Lamp Voltage: | 12 Volts | |
| Lamp Current: | 4.17 Amperes | |
| Cap Type: | GX5.3 | Nickel Pins |
| Bulb Type: | MR-51 | MR-16 in eighths/inch |
| Bulb Finish: | Dichroic Mirror | Vycor capsule |
| Filament Type: | C-6 | Transverse Coil |
| Atmosphere: | Bromine-Argon | |
| Luminous Flux: | N/A | |
| Luminous Efficacy: | N/A | |
| Luminous Intensity: | candelas | |
| Beam Distribution: | 38 mm focal dist. | |
| Colour Temperature & CRI: | CCT: 2850K | CRI: Ra 99 |
| Chromaticity Co-ordinates: | CCx: 0.448 | CCy: 0.408 |
| Rated Lifetime: | 1500 hours | to 50% survival |
| Burning Position: | Universal | |
| Max. Overall Length: | 44 mm | 1 3/4" |
| Working Distance: | 38 mm | 1 1/2" |
| Factory: | Bellevue, OH | U.S.A. |
| Date of Manufacture: | 1976 February | Date Code: 50 |
| Original Value: | US $13.50(1976) | |
