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SELZ Blacklight Reflector ДРУФЗ 125-1 (DRUFZ 125-1) |
In the simplest case this can be achieved with an aluminium reflector, which offers high reflectivity of UV-A wavelengths. However, the position of mercury arc tubes within their large outer bulbs is often poorly defined, and the resulting optical control leaves a lot to be desired. In Western countries this was addressed by using a standard clear mercury reflector lamp such as the H44GS-100 with a separate blacklight filter. That arrangement was cumbersome and required lamps to be used in a sealed housing to avoid leakage of visible light.
Around 1978 the Saransk Electric Lamp Plant developed this unique lamp having a reflector-shaped Wood's glass bulb with internal aluminiused mirror. Its powerful beam causes strong fluorescence in objects up to five metres away, and it was widely used for non-destructive inspection. The bulb appears to be internally frosted over part of its front face, perhaps to achieve a more uniform or broader beam. It is interesting to note the unusual electrode construction in the X-Ray image, in which a tungsten coil is slipped over a hairpin-shaped tungsten wire. In addition to this ДРУФЗ 125-1, in later years a ДРУФЗ 125-3 was made by Lisma. The differences are not known. Reflector blacklight lamps remained unique within the former Soviet Union, but fell into obsolescence when the principal Russian discharge lamp makers ceased operations around the turn of the century.
| Manufacturer: | СЭЛЗ (SELZ Saransk Electric Lamp Plant) | |
| Lamp Power: | 125 Watts | |
| Lamp Current: | 1.15 Amps | |
| Lamp Voltage: | 125 Volts | |
| Cap Type: | E27/36x30 | Ni plated brass + porcelain |
| Bulb Type: | R-125 | R-40 in eighths/inch |
| Bulb Finish: | Internally Aluminised | Wood's Glass |
| Electrodes: | Backwound Tungsten | Double carbonate emitter |
| Atmosphere: | Inner: Hg|Ar | Outer: Nitrogen |
| Luminous Flux: | <5 lm | |
| Luminous Efficacy: | <0.04 lm/W | |
| UV-A Flux: | 1.25 Wrad | 320-400 nm |
| UV-A Irradiance: | 35 W/m² | @ 0.5m distance |
| Beam Angle: | 15° | @ 50% peak intensity |
| Chromaticity Co-ordinates: | CCx: 0.395 | CCy: 0.400 |
| Rated Lifetime: | 1500 hours | |
| Warm-up & Re-strike Time: | 3 minutes | 3 minutes |
| Burning Position: | Universal | |
| Overall Length: | 190 mm | 7½ inches |
| Factory: | Saransk | Russia |
| Date of Manufacture: | 1983 September | Date Code: 0983 |
| Original Value: | Unknown | |
