公开(公告)号：EP1514296A1

公开(公告)日：2005-03-16

申请号：EP03727869.4

申请日：2003-06-05

申请人： Koninklijke Philips Electronics N.V.

发明人： WAUMANS, Lars, R., C. ,  VAN DER BURGT, Petrus, J., M. ,  GIELEN, Johannes, W., A., M. ,  VAN DER POL, Adrianus, J., H., P. ,  VAN KEMENADE, Johannes, T., C. ,  MOENCH, Holger ,  HELLEBREKERS, Wilhelmus, M. ,  DE MAN, Rolf, E. ,  HENDRIX, Johan, L., V. ,  DORLEIJN, Jan, W., F. ,  DE GROOT, Josephus, J.

IPC分类号： H01J61/72 ,  H01J61/48 ,  A61N5/06

CPC分类号： H01J61/72 ,  A61N5/0614 ,  H01J61/42 ,  H01J61/94

摘要： Low-pressure mercury vapor discharge lamp has a discharge vessel (1) enclosing a discharge space (3) provided with an inert gas mixture and mercury. A first portion (11) of the discharge vessel is provided with a first electrode (12) and a luminescent layer (16), radiating light in a first range of the electromagnetic spectrum. A second portion (21) of the discharge vessel is provided with a second electrode (22), radiating light in a second range of the electromagnetic spectrum, said second range being different from the first range. According to the invention, the low-pressure mercury vapor discharge lamp comprises current supply conductors (12A, 12B; 22A, 22B) for receiving a DC current, and the discharge space contains only two electrodes (12, 22). The discharge lamp has a variable color temperature. Preferably, the discharge lamp influences the melatonin cycle in a human subject. Preferably, the lumen output level is independent of temperature.

公开(公告)号：EP1869955A2

公开(公告)日：2007-12-26

申请号：EP06727737.6

申请日：2006-03-27

申请人： Koninklijke Philips Electronics N.V.

发明人： DE GROOT, Josephus, J. ,  WAUMANS, Lars, R., C. ,  VAN DER VEEN, Geert, W. ,  STOMMEN, Theodoor, H.

IPC分类号： H05B41/295

CPC分类号： H05B41/2988 ,  H05B41/295

摘要： The lamp life of a gas discharge lamp (6) depends inter alia on the deterioration of an electrode of the lamp during operation. The deterioration depends on an operating temperature of the electrode. A method according to the present invention for controlling the lamp life includes controlling the electrode temperature during operation by generating a temperature signal (12) representing the electrode temperature and providing said signal to a lamp driver circuit (4) operating said lamp. The lamp driver circuit controls an operating signal (10) supplied to the lamp (6) in order to control the electrode temperature to lie within a predetermined temperature range, thereby minimizing damage to the electrode during operation.