EP 0078105 A3 19831116 - IMPROVEMENTS IN OR RELATING TO HIGH PRESSURE SODIUM LAMPS
Title (en)
IMPROVEMENTS IN OR RELATING TO HIGH PRESSURE SODIUM LAMPS
Publication
Application
Priority
GB 8132443 A 19811028
Abstract (en)
[origin: EP0078105A2] The invention provides an improved high pressure sodium lamp of nominally 70 watt rating operating at a lamp voltage V of substantially 70 - 130 volts in which for satisfactory life, efficacy and colour, for an arc tube of internal diameter d in the range 3.0 to 5.0mm, the sodium mole fraction x, in the range 0.63 - 0.8, and arc length l are determined by interpolation or extrapolation on the graph of Figure 3 or by the equation l = 4d + 11.76x + 0.25 V - 16.4
IPC 1-7
IPC 8 full level
H01J 61/22 (2006.01); H01J 61/82 (2006.01); H01J 61/88 (2006.01)
CPC (source: EP)
H01J 61/22 (2013.01); H01J 61/825 (2013.01)
Citation (search report)
- [A] US 3906272 A 19750916 - COLLINS BYRON R, et al
- [A] JOURNAL OF ILLUMINATING ENGINEERING SOCIETY, vol. 10, no. 4, July 1981, pages 237-244, New York, USA., J.F. WAYMOUTH et al.: "Analysis of factors affecting efficacy of high pressure sodium lamps"
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
EP 0078105 A2 19830504; EP 0078105 A3 19831116; JP S5880261 A 19830514
DOCDB simple family (application)
EP 82304926 A 19820917; JP 17469782 A 19821006