UFC 3 -520-01
June 10, 2002
Four wire dimming in which a remote control device generates a 0 to 10 volt dc
signal and is compatible with certain electronic ballasts for fluorescent and compact
fluorescent lamps, and for dimming incandescent lamps, inductive loads, and some
other light sources through solid-state dimming within theatrical-style dimming
Proprietary control systems that are designed for specific loads, the most common
being digita l controls that send encoded signals to specific electronic ballasts for
fluorescent lamps, and analog systems designed to dim HID lamps.
F-12.4.3 Dimming systems can be controlled by manual stations or hand -held
controllers, or automatically by photosens ors, motion sensors, building automation
systems or other devices.
F-12.4.4 The specific combination of dimmer, lamp and ballast or transformer is critical
for the proper performance of any dimming system. When dimming is to be employed,
systems should be designed with close attention to the various components and
specifications for luminaires should be very exacting in calling out those parts that
depend on the specific dimming system.
F-12.4.5 Consider dimming systems for specific applications as follows:
Architectural Dimming. For applications in which dimming is required to adjust
lighting for different times of the day, such as in a dining room, or for different uses
of a space, such as a conference room with audio-visual capabilities.
Daylighting. Where dimming is controlled by a photosensor to save energy in
interior spaces where adequate natural illumination is available during occupancy.
Lumen Maintenance. Where dimming is controlled by a photosensor to save energy
in interior spaces by compensating for recoverable light loss. Lumen maintenance is
usually applied to lower light levels when lamps are new, but the light levels (and
energy usage) are gradually increased as needed to maintain proper light levels
throughout the maintenance cycle (refer to Figure F -2).
Demand Profile Management. Where dimming is controlled by a system designed
to reduce peak electrical demand.
Tuning. Where dimming is used to tune interior lighting levels to save energy by
better matching individual spaces and worker needs.