![]() If there still are concerns about leaving occupants in the dark, a single, low wattage fixture can be left switched on at all times to provide backup lighting.Ī second part of this myth is that, as a result of their frequent on-off cycles, occupancy sensors kill lamp life. ![]() By selecting the right type of occupancy control and by properly placing that control, most false readings can be eliminated. Objects within the space or unusual room configurations can partially block the view of sensors resulting in false readings. Sensors have a limited viewing range and angle. To be effective, the sensor needs to be able to see all or most of the space. In most cases, the failure of the occupancy sensor to detect occupants is the result of installation or application errors, not the fault of the occupancy sensor. If the space is still in use, the occupants can be left in the dark. If no motion is sensed and the timer reaches its preset interval, the lights are turned off. Each time that motion is detected, the sensor's timer is reset. Once detected, the sensor turns the lights on for a preset amount of time. Most occupancy sensors work by detecting motion. One of the biggest complaints concerning the occupancy sensor is that it can leave occupants in the dark if it falsely believes that the space is unoccupied. Depending on how frequently the area is used and how diligent people have been in turning off lights when they're not needed, occupancy sensors can reduce lighting use in these areas by up to 90 percent. They have been applied in spaces ranging from individual offices to restrooms, storage rooms, conference rooms and library stack areas. Perhaps the most widely used lighting control system is the occupancy sensor. MYTH #4: Occupancy sensors leave you in the dark This range of dimming makes the systems particularly suitable in a wide range of applications that currently use incandescent lamps. Practically all fluorescent lamps can be dimmed to 5 percent of the lamp's rated light output. The range of dimming that can be achieved in the latest generation of dimming ballasts for fluorescent lamps depends on the particular ballast design and the type of lamp used. Maintaining the electrode heater voltage while reducing light output levels means that the overall efficiency of the lamp will be reduced when it is operated at dimmed levels, but this reduction in efficiency is more than offset by the total reduction in energy use. Dimming a fluorescent lamp requires a reduction in the lamp arc current while the electrode heater voltage is maintained. While some dimming resulted, it was inconsistent, resulted in lamp flicker, reduced lamp life, and could not be used over a very wide range of illumination.įluorescent lamps cannot be dimmed using incandescent lamp dimmers. ![]() Incandescent dimming systems range from small, low wattage units, to ones capable of dimming several kilowatts of lights.īut problems arose when people tried to use incandescent dimmers with fluorescent lighting systems. One of the long-standing advantages of incandescent lamps is their ability to be dimmed smoothly and evenly from full brightness to zero.
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