STANDARD "OSIRA" LAMPS
(1934-1935)
| Lamp wattage | 250 | 400 |
| Standard cap | G.E.S. | G.E.S. |
| Initial light output in lumens | 9000 | 17000 |
| Efficiency in lumens per watt (initial) | 36 | 42½ |
| Guaramteed average live in hours | 1500 | 1500 |
| Overall length in millimetres | 290 | 325 |
| Outside diameter in millimetres | 50 | 50 |
| NOTE :- 290mm = 11¾ins 325mm = 12¾ins 50mm = 1 15/16ins |
The OSIRA H.P.M.V. lamp is manufactured in two wattages and four voltage ranges
to suit the actual voltages available at the units :-
- 200/210-volt 250-watt lamp and 220-volt 250-watt lamp. (These two lamps must be used
with the G.E.C. Z1860 L50 choke.)
- 230-volt 250-watt lamp and 240/250-volt 250-watt lamp. (These two lamps must be used
with the G.E.C. Z1860 H50 choke.)
- Price each £1 17 6
- 200/210-volt 400-watt lamp and 220-volt 400-watt lamp. (These two lamps must be used
with the G.E.C. Z1870 L50 choke.)
- 230-volt 400-watt lamp and 240/250-volt 400-watt lamp. (These two lamps must be used
with the G.E.C. Z1870 H50 choke.)
- Price each £2 0
- "OSIRA" LAMPS (Colour Modified)
- High Pressure Mercury Vapour, Cadmium and Zinc
- Not recommended for street lighting
- OSIRA lamps cam be supplied with a greater percentage of red than the standard lamps,
but these lamps are less efficient.
- Particulars on application.
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THE "OSIRA" LAMP
Manufactured under one or more of the following British patents: 344497, 384067,
391971, 397162, 405605, and other British Patents and pending patent applictions.
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