Instant start

Ballast

Rapid start

Preheat

For supplying a higher operating current

Smoothing the sinusoidal operating current

Limiting the current flowing through the fluorescent tube filaments

Heating the filaments continuously during operation

Loose connection in the choke

Loose core

Loose winding turns

Loose cover screw

Tube lamp will begin to flicker

Tube lamp will go out immediately

Tube will operate normally

Tube will begin to hum very much

low voltage and limit current

low voltage and increase current

high voltage and limit current

high voltage and increase current