EP0078105A3 - Improvements in or relating to high pressure sodium lamps - Google Patents

Improvements in or relating to high pressure sodium lamps Download PDF

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Publication number
EP0078105A3
EP0078105A3 EP82304926A EP82304926A EP0078105A3 EP 0078105 A3 EP0078105 A3 EP 0078105A3 EP 82304926 A EP82304926 A EP 82304926A EP 82304926 A EP82304926 A EP 82304926A EP 0078105 A3 EP0078105 A3 EP 0078105A3
Authority
EP
European Patent Office
Prior art keywords
high pressure
pressure sodium
relating
sodium lamps
range
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP82304926A
Other languages
German (de)
French (fr)
Other versions
EP0078105A2 (en
Inventor
Paul Linley Denbigh
Bryan Frederick Jones
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thorn EMI PLC
Original Assignee
Thorn EMI PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thorn EMI PLC filed Critical Thorn EMI PLC
Publication of EP0078105A2 publication Critical patent/EP0078105A2/en
Publication of EP0078105A3 publication Critical patent/EP0078105A3/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
    • H01J61/18—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent
    • H01J61/22—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent vapour of an alkali metal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/82—Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr
    • H01J61/825—High-pressure sodium lamps

Abstract

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
EP82304926A 1981-10-28 1982-09-17 Improvements in or relating to high pressure sodium lamps Withdrawn EP0078105A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8132443 1981-10-28
GB8132443 1981-10-28

Publications (2)

Publication Number Publication Date
EP0078105A2 EP0078105A2 (en) 1983-05-04
EP0078105A3 true EP0078105A3 (en) 1983-11-16

Family

ID=10525447

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82304926A Withdrawn EP0078105A3 (en) 1981-10-28 1982-09-17 Improvements in or relating to high pressure sodium lamps

Country Status (2)

Country Link
EP (1) EP0078105A3 (en)
JP (1) JPS5880261A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0081918A3 (en) * 1981-12-11 1984-05-02 THORN EMI plc High pressure sodium lamps
EP0837492A3 (en) * 1996-10-16 1998-05-27 Osram Sylvania Inc. High intensity discharge lamp with intermediate pressure xenon fill gas

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3906272A (en) * 1974-04-01 1975-09-16 Gen Electric Low wattage high pressure sodium vapor lamps

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3906272A (en) * 1974-04-01 1975-09-16 Gen Electric Low wattage high pressure sodium vapor lamps

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
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" *

Also Published As

Publication number Publication date
JPS5880261A (en) 1983-05-14
EP0078105A2 (en) 1983-05-04

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): DE FR GB NL

PUAL Search report despatched

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AK Designated contracting states

Designated state(s): DE FR GB NL

17P Request for examination filed

Effective date: 19831215

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19841218

RIN1 Information on inventor provided before grant (corrected)

Inventor name: DENBIGH, PAUL LINLEY

Inventor name: JONES, BRYAN FREDERICK