F: Lighting Controls Flashcards
specifically energy controls, can
help reduce the overall energy savings.
Lighting Controls
It control the lighting output by
modifying the sine wave cycle of electricity and each type of dimmer
does this different.
DImmers
dimmer controls installed in the wall.
Wall Box Dimmers
oldest and simplest dimming mechanism. It
utilizes a variable resistor in series with the lighting fixtures and
controllable using an arm passing through coils of wire (resistors).
Resistance Dimming
are both related and best explained
together. The mechanism is best explained by looking the wave graph of the electricity once controlled by these dimmers.
Forward Phase and Reverse Phase Dimming
a dimming mechanism where the lighting control
intensity is done by varying the “on” point in each half of the cycle, thus controlling the amount of power delivered to the lamp.
Forward Phase Dimming
a dimming mechanism opposite of the forward
phase dimming where lighting control intensity is done by varying the “off” point in each half of the cycle.
Reverse Phase Dimming
- a dimming mechanism similar to resistance dimming by
modifying the entire electrical sine wave. Advantages include wider application to different devices, the lack of humming or harmonics. Disadvantage include the higher cost.
Sine wave dimming
component required for linear and compact fluorescent lamps
and usually up to 10% dimmed only since too much dimming is often unnecessary. These come in different forms and wiring like two-wire ballasts, 3-wire ballasts and 4-wire ballasts.
Passive Infrared (PIR)
These sensors combine motion detection and switches usually built-in and with adjustable timer and sensitivity depending on the usage and space. This adjustment sensors that respond to changes in background heat at a per space is called “commissioning”.
Passive Infrared (PIR)
- sensors emitting unheard high frequency sound waves which
bounces off of the objects to sense if the space is empty.
Ultrasonic sensors
