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Technical Control Gear Selection Fluorescent Control Gear Selection Most fluorescent luminaires detailed in this catalogue are available with a choice of control gear. There are four main electrical circuits to choose from, each with its own particular advantages. Switch Start DALI This is the simplest circuit and therefore most economical to purchase where the capital cost of the installation has to be kept to a minimum. The circuit consists of magnetic copper/iron ballast, a capacitor and a glow starter canister. It is very important to replace defective starters to prevent gear overheating and damage. It is recommended that the starter is replaced whenever a new lamp is installed. This circuit type is available for many of the luminaires listed in this catalogue. This circuit has the advantages of digital high frequency dimming but with the additional advantages that each ballast can be individually addressed allowing lighting control systems to communicate commands to individual luminaires. It is also possible for the lighting control system to interrogate and receive feedback from each individual ballast. High Frequency This circuit uses the latest electronic technology to give substantial benefits to the user. It provides all the benefits of electronic start, flicker free soft starting, extended lamp life, improved lumen maintenance and automatic shutdown of failed lamps. In addition the lamp is driven at high frequency, offering an instant energy saving of approximately 20% over the other circuits, using exactly the same lamps. High frequency circuits run at near unity power factor, reducing VA load and therefore cutting the electricity costs of users on maximum demand tariffs. Additionally, the light is perfectly flicker free. Flicker free lighting greatly reduces the incidence of headaches and eye strain, eliminates distractions and thus improves workplace quality and productivity. For production areas, high frequency lighting prevents the dangerous stroboscopic effects often experienced with switch start and electronic start circuits, when using rotating machinery. High frequency lighting is also completely silent in operation. 1-10 Volt Analogue This circuit has all the advantages of high frequency, but with the added benefit of being able to dim and brighten (regulate) the lamps. The light regulation is by a separate pair of conductors which can regulate the lamp lumen output by either supplying a 1-10 volt signal or by a potentiometer. This circuit can therefore be used for lighting and energy management systems. As lamps are dimmed, either manually or automatically, such as in response to an increase in daylight detected by a photocell, the ballast energy consumption is reduced. Therefore, further energy saving cost benefits can be realised. Digital High Frequency Regulating This circuit has all the advantages of high frequency, but with the added benefit of being able to dim and brighten (regulate) the lamps. This circuit is therefore used for lighting and energy management systems. As lamps are dimmed, either manually or automatically such as in response to an increase in daylight detected by a photocell, the ballast energy consumption is reduced. Therefore, further energy saving cost benefits can be realised. Digital regulating ballasts also provide precision control of light output, superior to that experienced with conventional analogue regulating ballast types. 536 DALI circuits are able to have a maximum of 64 DALI components on any single loop and a maximum cable length of 300 meters. Note: Switch/electronic start control gear should not be mixed on the same circuit as high frequency gear, as damage can result to the high frequency ballasts. Note: Luminaires supplied with dedicated controls may be dependent on the specific controls used, fitted with either digital high frequency regulating or DALI control gear. LED Drivers LED luminaires require control devices referred to as drivers. These can provide a constant current to the LED or can be constant voltage. These drivers are electronic circuits and care should be used to ensure that the correct type of driver is used. It is also important to ensure that a driver with the correct drive current and voltage is selected to ensure optimum operation of the LED. LED Drivers can be supplied with fixed output, DALI, and 1-10 volt operations. Please contact our Technical Support and Applications department for further information.