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Dimming fluorescent lighting guide 1

DIMMING FLUORESCENT LIGHTING GUIDE Dimming a uorescent lamp is di ?erent from a standard dimming circuit for GLS or Halogen Lamps All of the dimming is managed by the ballast not by the amount of voltage fed into the ?tting as is the case with a traditional dimmer switch Types of Dimming- Quick Guide Split into two main categories ANALOGUE - also known as - v or - v Switch type A potentiometer rotary slider with a separate control for turning on o ? Advantages ? An older system which some contractors feel more comfortable with ? No interference with the switching of the luminaire Disadvantages ? A separate ? dimming pair ? must be wired to each ?tting in the circuit ? Limited control options i e working with further applications such as ? Daylight linked dimming or movement detectors DIGITAL - also known as touch dim switch dim DSI or DALI Switch type Bell push push to make retractive Advantages ? Simple installation only a core cable needed as in an emergency lighting ?tting so sometimes no need to re-wire ? Greater control over dimming down to as low as ? Can be used in simple applications in conjunction with PIR ? s and daylight sensors Disadvantages ? Interference can occur with switching as control wire and switch wire run together Analogue Dimming Analogue dimming is known as - v dimming This is because the dimmable ballast produces a - v DC supply that can be increased or decreased by using a potentiometer Also known as a high frequency push rotary or slide dimmer switch The DC supply can be increased or decreased by the switch to a ?ect the resistance hence the dimness of the lamp This form of dimming requires a ? dimming pair ? of cables to be run around to each ?tting in the circuit in order for it to operate Digital Dimming Digital dimming can be split into sub sections - Switch dim Touch dim DSI and DALI Switch Dim Touch Dim This is the most popular and simplest option for digital dimming It is operated by a push to make or retractive switch which is then wired to each luminaire in the circuit via a core cable consisting of a switched live via a push to make neutral earth and an un-switched live The switch controls the switching on and o ? of the luminaire and also the dimming Each push on the button sends a pulse to the ballast which then reads it and controls the lamp accordingly Long push Hold down-Dim down up - Short push- Turns lamp on o ? DSI DSI stands for Digital Series Interface and is a more controllable version of digital dimming It enables the user to group luminaires operate daylight linked dimming and other controlling options This is wired using a dimming pair run to each luminaire in the circuit similar to the analogue system DSI is am Tridonic based technology and can be