Light and Light sources

Question 1

A type of lighting where the filament wire begins to glow when it is heated to a sufficiently high temperature by an electric current. It is also a thermal radiator.

Answer 1

Incandescent lamps

Question 2

suitable for exterior application due to its high resistance to changes in temperature; high-power pressed-glass reflector lamp.

Answer 2

Reflector lamp with pressed glass bulb and efficient parabolic reflector (PAR lamp)

Question 3

for mains voltage with screw cap and outer envelope. The outer envelope means that the lamp can be operated without a protective glass covering. Low-voltage halogen lamp with pin base and axial filament in a quartz glass bulb

Answer 3

Halogen Lamp

Question 4

combination of evaporated tungsten and halogen to produce tungsten halide in the peripheral area. Splitting of the tungsten halogens back to the filament

Answer 4

Halogen Cycle

Question 5

contrast to incandescent lamps that is not produced by heating a filament, but by exciting gases or metal vapours

Answer 5

Discharge lamps

Question 6

are mainly available in the form of tubular lamps, in which each lamp has a combination of two or four discharge tubes

Answer 6

Compact Fluorescent lamps

Question 7

have a considerably lower luminous efficacy than Conventional fluorescent lamps, but they have a long lamp life

Answer 7

High-voltage fluorescent tubes

Question 8

comparable to fluorescent lamps in the way they are constructed and how they operate. In this case sodium vapour is excited instead of mercury vapour

Answer 8

low-pressure sodium lamps

Question 9

have a short quartz glass discharge tube that contains a mixture of inert gas and mercury. Electrodes are positioned at both ends of the discharge tube

Answer 9

High-pressure mercury lamps

Question 10

with a quartz glass discharge tube for high-pressure mercury discharge and an additional filament that takes on the function of pre-resistance and supplements the spectrum in the red range. The elliptical bulb is frequently provided with a coating of light-diffusing material

Answer 10

Self-ballasted mercury lamps

Question 11

are a further development of mercury lamps and are therefore similar to these with regard to construction and function. have the advantage that they melt at a considerably lower temperature

Answer 11

Metal Halide lamps