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Mercury Fluorescent
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Updated
16-XII-2022 |
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High pressure mercury lamps are rich in blue, green and yellow wavelengths but almost entirely devoid of red radiation, which produces a cool white light colour having very poor colour rendering properties. One of the most succesful mechanisms to counter this was by the application of fluorescent phosphors to the outer bulb, in an attempt to convert some of the ultraviolet radiation from the discharge into more useful red wavelengths.
The first successful lamp was achieved by Osram-GEC of England in 1937, with the application of a copper-activated zinc cadmium sulphide phosphor. Subsequent decades saw the development of dozens of different phosphors, each offering progressive improvements in terms of lowering the colour temperature of the light, improving colour rendering, and where possible also improving the luminous efficacy of mercury fluorescent lamps. Several of the principle developments are illustrated below, grouped according to the type of phosphor chemistry or the intended application. |
| | Sulphide Phosphors |
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GEC |
400W |
| MAF/V Mercury Cadmium Fluorescent |
| 1952 |
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Mazda |
400W |
| MAF/V Mercury Cadmium Fluorescent |
| 1945 |
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Philips |
75W |
| Philora HPL300 with Sulphide phosphor |
| 1938 |
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| | Germanate & Arsenate Phosphors |
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GEC |
125W |
| MBF/V with Magnesium Fluoro-germanate |
| 1961 |
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Sylvania |
100W |
| H100/C with Magnesium Fluoro-germanate |
| 1961 |
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Philips |
250W |
| HPL with Magnesium Arsenate |
| 1965 |
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Narva |
400W |
| HQL-G Goldweiss with Mg Fluoro-germanate |
| 1971 |
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Osram |
50W |
| HQL half coated demonstration lamp |
| 1964 |
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| | Orhophosphate Phosphors |
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GE |
175W |
| Bonus Line H175-39/W Impregnated electrodes |
| 1963 |
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Westinghouse |
400W |
| H400/W with strontium zinc orthophosphate |
| 1968 |
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Narva |
250W |
| HQL-S Silberweiss with orthphosphate coating |
| 1969 |
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Osram |
400W |
| HQL-S Silberweiss with orthphosphate coating |
| 1969 |
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| | Halophosphate Phosphors |
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Tesla |
125W |
| RVL-B with calcium halophsophate coating |
| 1971 |
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| | Vanadate Phosphors |
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Polam |
125W |
| LRF with Vanadate and Orthophosphate coating |
| 1976 |
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Sylvania |
175W |
| H175/DX with Yttrium Vanadate coating |
| 1979 |
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GEC |
1000W |
| MBF/U with Yttrium Vanadate coating |
| 1977 |
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Westinghouse |
100W |
| H100/DX with Yttrium Phosphate Vanadate |
| 1983 |
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Toshiba |
200W |
| HFX 200 Japanese style fluorescent mercury |
| 1990 |
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DuroTest |
175W |
| Safe-T-Vapor lamp with internal oxygen fuse |
| c. 1980 |
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Westinghouse |
400W |
| Safety Lifeguard with internal cut-out device |
| 1981 |
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Thorn |
125W |
| MBF half coated demonstration lamp |
| 1986 |
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| | Vanadate-Deluxe Phopshors |
|
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Sylvania |
400W |
| H33-1-GL/WDX Warm Deluxe colour |
| 1973 |
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Sylvania |
100W |
| H100/N Warmtone with Vanadate + YAG + dye |
| 1982 |
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Westinghouse |
400W |
| H400/R Beauty Lite with high red ratio |
| 1982 |
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Philips |
400W |
| HPL Deluxe with Coarse Grain Vanadate coating |
| 1983 |
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Philips |
80W |
| HPL Comfort with Coarse Vanadate + YAG coating |
| 1993 |
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Osram |
50W |
| HQL-B Super Deluxe with Vanadate + Gold Laquer |
| 1993 |
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| | Filtered Yellow Lamps |
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Westinghouse |
400W |
| H400/Y Caution Yellow with external lacquer |
| 1969 |
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Osram |
250W |
| HQL/5 Caution Yellow with external lacquer |
| ~1965 |
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| | Fluorescent Reflector Lamps |
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Philips |
125W |
| HPLR E40 Cap Reflector with Arsenate Phosphor |
| 1969 |
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GEC |
125W |
| MBFR/U Mercury with Ellipsoidal Reflector |
| 1977 |
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Thorn |
400W |
| MBFR/U Mercury Fluorescent Reflector |
| 1988 |
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Meda |
250W |
| HML250-PR Side Reflector Streetlighting |
| c. 1960s |
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Narva |
125W |
| NF125-21 Street lighting with ellipsoidal reflector |
| 1979 |
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Philips |
400W |
| HLRG Horticultural with ellipsoidal reflector |
| 1975 |
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SELZ |
400W |
| DRLF400-1 Horticultural with ellipsoidal reflector |
| 1983 |
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