Which is NOT a type of lighting timer?

Which is NOT a type of lighting timer?

• A. Simple timers
• B. Photocell timers
• C. Programmable timers
• D. Motion sensors

Answer: (D)

Lighting timers control lights based on a schedule or ambient light level, not on sensing occupancy. The three timer types you’ve learned about set or adjust when lights turn on and off: simple timers are basic on/off devices with a fixed schedule, photocell timers use daylight levels to decide when to operate, and programmable timers allow detailed scheduling for different days and times. Motion sensors, however, are reactive controls—they turn lights on when movement is detected and typically turn them off after a period of inactivity. They’re occupancy controls, not timers, which is why they aren’t considered a type of lighting timer.

Lighting timers control lights based on a schedule or ambient light level, not on sensing occupancy. The three timer types you’ve learned about set or adjust when lights turn on and off: simple timers are basic on/off devices with a fixed schedule, photocell timers use daylight levels to decide when to operate, and programmable timers allow detailed scheduling for different days and times. Motion sensors, however, are reactive controls—they turn lights on when movement is detected and typically turn them off after a period of inactivity. They’re occupancy controls, not timers, which is why they aren’t considered a type of lighting timer.