Lamps
The most common types of lamp encountered today are:-
· Filament Lamps, known as GLS lamps. ( General Lighting Service ).
· Tungsten Halogen Lamps, known as TH lamps
· Fluorescent Lamps, known as Low Pressure Mercury Vapour lamps sometimes abbreviated to MCF ( M = Mercury, C = Low Pressure, F = Fluorescent ).
Life Expectancy of Lamps
A general rule is that the life expectancy of a GLS lamp is approximately 1000 hours and the life expectancy of a fluorescent lamp is 8000 to as high as 15000 hours.
Note: These are average life expectancies, there are a number of conditions that influence life expectancy e.g. supply voltage, working position, ambient temperature, atmospheric conditions etc.
Types of Lampholder in Common Use
Bi-Pin, Bayonet Cap and Edison Screw type lampholders are commonly used in industrial applications. In these cases the relevant ETCI Rules will apply.