The connection from the main control station to the logic units is by standard telephone wires (called a "bus-line"). The logic units are connected to standard 230 V mains for input and can selectively switch on and off individual output circuits, depending on the control signal from the bus-line. Overriding of the programmed lighting cycle can be done via infrared sensors located in key areas of the ceiling and using a hand-held infrareds transmitter (like the remote control of a TV set).
6. Coordinate (wherever the orientation of a building permits) daylighting to be used with electric lighting. But ensure that this does not introduce glare or a severe imbalance of brightness in visual environment. As explained earlier, the use of daylight will have to be very limited because of solar heat gain and increased air-conditioning load. In many cases, a switching method to enable reduction of electric light in the window-zones during certain hours will be the right answer.
7. Establish an adequate maintenance programme for periodic cleaning of luminaires and group replacement of lamps. In order to make the best use of energy, a lighting installation must be well maintained, thus avoiding undue light losses and lamp failures. It is economically advantageous in large installations not to replace lamps individually (when each lamp fails in a sporadic manner), but do so for the whole installation at one time (group replacement)
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