FIELD: lighting.
SUBSTANCE: invention relates to electric light control systems, which enable to control brightness of light in space, including mounted light source and an external light source. Dual-mode light sensor (106) measures and computes amount of external light and electrical light incident on its sensing surface. Individual measured light components (total light, electric light and external light) are transmitted to window treatment controller (103) and electric light controller (102). Controllers (102, 103) use this information to optimally control lighting condition and reduce energy consumption. Both controllers (102, 103) operate concurrently and independently, but are linked via dual-mode sensor (106).
EFFECT: electric light control system is disclosed.
15 cl, 7 dwg
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