Sharp QT-80W Instruction Manual download pdf (Page 10)

ballast is responsible for preheating the lamp electrodes, for sufficient

ignition voltage and for limiting the lamp current.

1.4 Different Principles,

Different Behavior

The basic functions that are mentioned in chapter 1.3, can usually be

carried out with electromagnetic (inductive) ballasts. These ballasts are

classified into conventional control gear (CCG) and low loss ballasts (LLG).

The latter follow the same principle as CCG, however, due to different

engineering design they consume less energy. The much better solution is

to operate fluorescent lamps with Electronic Control Gear (ECG). Besides

the advantages of flicker-free lighting, longer lamp life and higher system

efficacy (lamp + ECG), features such as lamp ignition, limitation of the lamp

current and compensation are integrated into the ECG. Most Electronic

Control Gear are also suitable for DC operation, which means they can be

used in emergency lighting installations.

T5/ ∅ 16 mm fluorescent lamps FH

…HE, FQ

…HO and FC

can only be

operated by Electronic Control Gear.

If fluorescent lamps are operated with magnetic ballasts (principle of

magnetic coil, CCG and also low loss ballast), the lamp current equals the

frequency of the mains voltage. The resulting stroboscopic effect can be

dangerous in cases where people work with rotary machines. Every time,

the voltage goes through zero, the lamp current does the same until the

lamp is reignited: for every lamp ignition new carriers for the electric charge

have to be build up within the gas discharge.

1.5 Advantages of

Electronic Control Gear

1.6 Saving Energy with

Electronic Control Gear

When using Electronic Control Gear the frequency of the lamp voltage is

approx. 1000 times higher than the line voltage. The zero of the lamp

current are passed so quickly that the average of the value of the electron

density is nearly constant within the discharge plasma. The electrons don’t

have to be built up with every cycle (as it is necessary when using CCG

and low loss ballasts). So the limitation of the lamp life due to reignition

peaks for CCG operation are avoided with ECG operation. Therefore no

stroboscopic effects can occur by using high frequency control gear as

there is no longer a gap in the lamp current. Therefore, one lamp type

needs less energy to generate the same lumens when operated with high

frequency control gear compared to operation with magnetic ballasts. The

lower energy consumption reduces the lamp load and increases the lamp

OPERATION WITHOUT

NOISE

LONGER LAMP LIFE

(approx. + 50%)

CALM AND

FLICKERFREE

LIGHT

ENERGY SAVING

(25 – 30%)

LOW MAGNETIC

STRAYFIELD

LOW

WIRING COSTS

LONGER

LAMP LIFE

(approx. 50%)

DIMMABLE

(spec. version)

LOWER

ENERGY

CONSUMPTION

(25 – 30%)

FLICKERFREE

START

LESS WASTE

DISPOSAL

(approx. 30%)

AUTOMATIC

SWITCH OFF AT END

OF LAMP LIFE

OPERATION WITHOUT

NOISE

LONGER LAMP LIFE

(approx. + 50%)

CALM AND

FLICKERFREE

LIGHT

ENERGY SAVING

(25 – 30%)

LOW MAGNETIC

STRAYFIELD

LOW

WIRING COSTS

LONGER

LAMP LIFE

(approx. 50%)

DIMMABLE

(spec. version)

LOWER

ENERGY

CONSUMPTION

(25 – 30%)

FLICKERFREE

START

LESS WASTE

DISPOSAL

(approx. 30%)

AUTOMATIC

SWITCH OFF AT END

OF LAMP LIFE

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Sharp QT-80W Instruction Manual Page 10

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