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536

LIGHTING SOLUTIONS

CA452001EN - March 2015

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

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.

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.

DALI

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.

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.