Test 2

Briefly describe how light is produced in a flourecent lamp

electrons from the cathodes strike the mercury atoms producing UV energy. The UV energy is converted to visible light by the phosphor coating onthe inner surface of the lamp glass

How is the colour of light output of varied in flourecent lamp?

By varying the type of phosphor powder

what are the two functions of a fluorecent lamp ballast

It produces sufficient striking voltage to initiate the arc and it acts as a choke to control the magnitude of the current

What is the diameter of a rapid-start T8 flourescent lamp

1"

Where are composit fluorescent lamps used

as a direct replacement for incandecent lamps

What two advantages does a fluorescent light source have over an incandescent

Higher efficacy and longer rated life

What is the three most common fuorescent lamp bases

Bi-pin, Single-pin and recessed double-contact

What is the average life of a fluorescent light

10,000 Hours

What is a major cause of premature ballast failure

High ambient temperature

What is the two sound ratings for ballast hum

A, F