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Thorn MBFR Kolorlux Mercury Discharge Reflector |
Firstly, the lamps provide good optical control but without the requirement for expensive reflector systems. Whereas competitive lamps traditionally employed a diffuse front window, it is left clear in the Thorn design. This delivers much better optical control with a considerably tighter beam angle, but there is some lack of colour uniformity throughout the illuminated area. However when lamps are used in quantity, as is typically the case with large-scale industrial illumination, there is some overlap between the beams of adjacent lamps which partly cancels this effect.
The second principal advantage of the reflector-style lamps is that optical performance is not restricted by the build-up of dirt or corrosion on reflecting surfaces, as is the case with conventional luminaires. With each new lamp comes a new optical system and there is, of course, no need for expensive cleaning maintenance of the luminaire on a regular basis.
The use of MBFR therefore reduces both capital installation costs, and maintenance / cleaning costs in all industrial applications which can accept the broader polar intensity distribution of this lamp over a high bay luminaire.
Technically, the construction of MBFR is similar to the standard MBF design. It employs the same °Kolorlux yttrium vanadate phosphors as standard lamps, with an undercoat of titanium dioxide before the phosphor layer acting as a reflective surface which also transmits some upward light.
| Manufacturer: | Thorn EMI | |
| Lamp Power: | 400 Watts | |
| Lamp Current: | 3.25 Amps | |
| Lamp Voltage: | 135 Volts | |
| Cap: | E40s/45 | Ni Plated + Vitrite |
| Bulb Finish: | Eu:YVO phosphor | TiO2 reflector coating |
| Bulb Type: | RD-180 | Borosilicate |
| Overall Length: | 300 mm | |
| Light Centre Length: | N/A | |
| Electrodes: | Backwound tungsten with triple carbonate emitter | |
| Atmosphere: | Inner : Argon | Hg | Outer : Nitrogen |
| Luminous Flux: | 20,500 lm @ 100 hours | 18,000 lm @ 2,000 hours |
| Luminous Efficacy: | 51.3 lm/W @ 100 hours | 45.0 lm/W @ 2,000 hours |
| Colour Temperature & CRI: | CCT: 3800K | CRI: Ra 35 |
| Chromaticity Co-ordinates: | CCx: 0.395 | ccy: 0.400 |
| Burning Position | Universal | |
| Rated Life: | 20,000hrs to 70% survival, 24,000hrs to 50% survival | |
| Factory: | Leicester, United Kingdom | |
| Date of Manufacture: | September 1988 | |
| Original / Present Value: | £38.50 (1988) | £62.40 (2001) |