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GE Miser BR30 Blown Bulb Reflector |
A number of design features are incorporated into the BR shape lamps. Firstly and of most significance, the diameter of the neck section which connects the bulb to the cap is reduced to minimise the quantity of light rays lost in a backwards direction. Secondly the former single reflector is replaced by a two-part optical surface, by adding a small secondary confocal paraboloid at the transition fillet between the main reflector and the bulb neck. Light rays impinging on this region of the bulb in an ordinary lamp tend to be reflected at a wide angle, and may not contribute to the useful output. However in BR lamps, rays striking the secondary reflector are redirected back towards the main reflector, and effectively collimated into the useful forward beam. Thirdly, the depth of the reflector is greater than in standard lamps. By flattening the curvature of the light emitting area of the bulb crown, a greater reflective surface is available and this affords a further increase in efficacy. Fourthly, a metal heat-shield is strategically positioned in the bulb neck to capture and reflect into the useful beam other light rays that would normally be lost towards the cap.
The approximate 10% efficacy improvement of BR reflectors has been translated into a range of lamps having 10% reduced power consumption for the same light output. In view of the performance advantage, standard R-lamps have begun to be phased out by government legislation in USA.
| Manufacturer: | General Electric USA | |
| Lamp Power: | 45 Watts | |
| Lamp Voltage: | 120 Volts | |
| Lamp Current: | 0.375 Amperes | |
| Cap Type: | E26/25 | Aluminium + Vitrite |
| Bulb Type: | BR-95 | BR-30 in eighths/inch |
| Bulb Finish: | Inside Frosted | Aluminised Reflector |
| Filament Type: | CC-6 | Coiled-Coil Transverse |
| Atmosphere: | 85:15 Argon:Nitrogen | Approx 0.8 bar |
| Luminous Flux: | 485 lumens | |
| Luminous Efficacy: | 10.8 lm/W | |
| Peak Intensity: | 300 candelas | |
| Beam Distribution: | 30° | to 50% peak intensity |
| Colour Temperature & CRI: | CCT: 2700K | CRI: Ra 100 |
| Chromaticity Co-ordinates: | CCx: 0.460 | CCy: 0.411 |
| Rated Lifetime: | 2000 hours | to 50% survival |
| Burning Position: | Universal | |
| Overall Length: | 136.5 mm | 53/8 inches |
| Light Centre Length: | 77.8 mm | 31/16 inches |
| Factory: | Ohio Lamp Plant, Warren | U.S.A. |
| Date of Manufacture: | January 1994 | |
| Original / Present Value: | Unknown | Unknown |
