Definition
CFLs are miniature fluorescent lamps
designed replace ordinary GLS
lamps.
Definition
A fluorescent lamp linear arc tube,
internally coated with fluorescent
powder, containing low-pressure
mercury vapour discharge. However, only lamps offering more than lumens
of light output are considered energy efficient the Government’s criteria.10 are extremely popular the lighting schemes of
the new millennium.11 shows three typical shapes. 11W energy-efficient lamp is
FIGURE 14. 10. For example, 20W energy-efficient lamp will give the
same light output 100 GLS lamp.
Discharge lamps
Discharge lamps not produce light means incandescent filament
but the excitation gas metallic vapour contained within glass
envelope. They are
available bi-pin package 20, and 50W and 230 bayonet
type cap (called GU10 GZ10 cap) 20, and lumens of
light output over its intended lifespan 2000h they are more energy effi-
cient than GLS lamps. The lamp
construction shown Fig.Electrical installations and wiring systems
289
Tungsten Halogen Dichroic Reflector Miniature Spot Lamps
Tungsten Halogen Dichroic Reflector Miniature Spot Lamps such the
one shown Fig. 14.23 and the control circuit Fig 10.24.
Energy-efficient lamps use electricity much more efficiently than equiv-
alent GLS lamp.10
Tungsten Halogen Dichroic Reflector Lamp.
FLUORESCENT TUBE
A fluorescent lamp linear arc tube, internally coated with fluorescent
powder, containing low-pressure mercury vapour discharge.
The ‘stick’ type give most their light output radially while the flat ‘double
D’ type give most their light output above and below. They are available variety shapes and sizes that they can
be fitted into existing light fittings. Their small size and bright white illumination makes
them very popular both commercial and domestic installations. voltage applied two terminals electrodes sealed into the end
of glass tube containing gas metallic vapour will excite the contents and
produce light directly. Figure 14.
COMPACT FLUORESCENT LAMPS
CFLs are miniature fluorescent lamps designed replace ordinary GLS
lamps.11
Energy-efficient lamps.
. Fluorescent tubes and CFLs operate this principle.
FIGURE 14
