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    • 7. 发明专利
    • FR2595897B1
    • 1988-08-12
    • FR8700326
    • 1987-01-14
    • LUTRON ELECTRONICS CO
    • CAPEWELL DENNIS MBENNETT LANDE MSPIRA JOEL SWILL GARY EZAHARCHUK WALTER S
    • H05B37/02H01R13/00H05B41/392H05B41/39
    • The system enables adjustment both of the ambient light level surrounding a user location 12 and of the contrast between the ambient light level and the intensity of a localised light source, e.g. a VDU screen, at the user location. A first control 33 is provided at the user location for adjusting the intensity of the localised light source 32, and a second control 34 is provided at the user location and operatively associated with a power controller 22 for enabling the user selectively to vary the power supplied to ambient lights 16 independently of the first control 33. The ambient light source (16') may be built into a modular work station (12'), (Fig. 3). The control 34 may be operated by hand or foot or in response to detection of the motion, voice or eyelid movement of the user. Control 34 may be linked to the power control circuitry by power line carrier transmission, optical fibre, a telephone system or a wireless link, one or two photosensors may be used to control ambient light level or ambient/local contrast. An interface 42 for use with a fluorescent light fitting has a plug (50), (Figs. 5,7)) to engage a power supply socket, a socket (46) to receive a plug (48) connected to the fitting, and is connected to a remote user control 34. Power control circuitry may be in the control 34 or in the interface 42.