The ‘stick’ type give most their light output radially while the flat ‘double
D’ type give most their light output above and below. 11W energy-efficient lamp is
FIGURE 14.
. 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. Fluorescent tubes and CFLs operate this principle. Their small size and bright white illumination makes
them very popular both commercial and domestic installations.
Energy-efficient lamps use electricity much more efficiently than equiv-
alent GLS lamp. The lamp
construction shown Fig.10 are extremely popular the lighting schemes of
the new millennium.
Discharge lamps
Discharge lamps not produce light means incandescent filament
but the excitation gas metallic vapour contained within glass
envelope.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.
FIGURE 14. 10. For example, 20W energy-efficient lamp will give the
same light output 100 GLS lamp. They are available variety shapes and sizes that they can
be fitted into existing light fittings. voltage applied two terminals electrodes sealed into the end
of glass tube containing gas metallic vapour will excite the contents and
produce light directly.11
Energy-efficient lamps. However, only lamps offering more than lumens
of light output are considered energy efficient the Government’s criteria.
Definition
A fluorescent lamp linear arc tube,
internally coated with fluorescent
powder, containing low-pressure
mercury vapour discharge.
COMPACT FLUORESCENT LAMPS
CFLs are miniature fluorescent lamps designed replace ordinary GLS
lamps. Figure 14.11 shows three typical shapes.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.
Definition
CFLs are miniature fluorescent lamps
designed replace ordinary GLS
lamps.23 and the control circuit Fig 10.24
