Single-ended short arc lamp of low colour temperature with reduced sodium loss

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(11)

EP 2 388 799 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	18.12.2013 Bulletin 2013/51

(43)	Date of publication A2:
	23.11.2011 Bulletin 2011/47

(21)	Application number: 11163623.9

(22)	Date of filing: 26.04.2011

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International Patent Classification (IPC):

H01J 61/82^(2006.01)
H01J 61/36^(2006.01)

H01J 61/24^(2006.01)
H01J 5/46^(2006.01)

(84)	Designated Contracting States:
	AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
	Designated Extension States:
	BA ME

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Priority:

26.04.2010 IN DE09972010

(71)	Applicant: Flowil International Lighting (Holding) B.V.
	1097 JB Amsterdam (NL)

(72)	Inventors:
	Hooker, James Ardvasar, Isle of Skye, SCOTLAND, IV45 8 (GB) Derhaeg, Lode 3290 Diest (BE) Adolf, Marc 3300 Tienen (BE)

(74)	Representative: Cerbaro, Elena et al
	Studio Torta S.p.A. Via Viotti, 9 10121 Torino 10121 Torino (IT)

(54)	Single-ended short arc lamp of low colour temperature with reduced sodium loss

(57) The present disclosure provides a single ended short arc metal halide lamp without outer jacket comprising an arc tube (101) equipped with a pair of tungsten electrodes (102), wherein the arc tube is filled with sodium-bearing metal halide chemistry and an electrical return lead (108) is contiguously juxtaposed alongside the arc tube. The return lead (108) is completely or partially embedded in a fused glass sleeve (107), thereby interrupting the cycle of sodium loss and leading to low colour temperature of the lamp, which is stable during life.

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