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Sylvania Professional Deluxe - M269 BAB |
Competitors were swift to follow suit and also offered sealed lamps. However they favoured a clear glass front lens, combined with a the traditional faceted mirror to achieve the necessary beam distribution. Sylvania's Tru-Aim professional employed a smooth specular mirror with textured front lens to set the beam angle. Despite the superior beam distribution it achieved, with no striations or dark spots, the appearance of the lamp itself was rather flat. Since the lamp could now be on view customers preferred the glittering sparkle of the facetted mirror, regarless of the frequent inhomogeneity in the light distribution.
In 1991 Sylvania replaced Tru-Aim Professional with the new Professional DeLuxe lamp shown on this page, following an extensive European survey as to what features customers favoured most. It features a clear lens and introduced the new spiral design of facets. By rotating each successive ring of facets around an axial filament, an impressively high beam uniformity was achieved. This gave customers the sparkle they desired but without compromising on the beam uniformity which had made its predecessor the favourite of lighting designers. At the same time, life was increased 25% to 4000 hours, and the slotted GU5.3 base was introduced.
| Manufacturer: | GTE Sylvania | |
| Lamp Power: | 20 Watts | |
| Lamp Voltage: | 12 Volts | |
| Lamp Current: | 1.67 Amperes | |
| Cap Type: | GY5.3 | Glass base |
| Bulb Type: | MRC-51 | MRC-16 in eighths/inch |
| Bulb Finish: | Clear Lens | Dichroic Mirror |
| Filament Type: | C-8 | Axial single coil |
| Atmosphere: | 25% Argon in Kr | HBr-SiH4-PH3 |
| Luminous Flux: | 1000 lm | (capsule flux) |
| Luminous Efficacy: | 20.0 lm/W | (capsule efficacy) |
| Peak Intensity: | 790 candelas | to half-peak intensity |
| Beam Distribution: | 38.0° | to half-peak intensity |
| Colour Temperature & CRI: | CCT: 2925K | CRI: Ra 100 |
| Chromaticity Co-ordinates: | CCx: 0.444 | CCy: 0.406 |
| Rated Lifetime: | 4000 hours | to 50% survival |
| Burning Position: | Universal | |
| Overall Length: | 48.0 mm | 1 7/8" |
| Light Centre Length: | N/A | N/A |
| Factory: | Tienen | Belgium |
| Date of Manufacture: | 6th June 1992 | Date Code 18 106 |
| Original / Present Value: | GB £7.71 trade (1987) | GB £14.99 (2006) |
