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Figure 4.9. Reflector lamp.
PARABOLIC ALUMINIZED REFLECTOR
(PAR) lamps produce a controlled
beam of light. See Figure 4.10.
There is a range of beam widths
from narrow spot to wide flood.
The beam spread is controlled by
the lens pattern of the front
glass.
The two-piece, pressed hard glass
construction provides better beam
control than the standard
reflector lamp. PAR lamps are also
suitable for exterior use in a
suitably protected lampholder.
Figure 4.10. PAR lamps.
CROWN MIRRORED lamps are a form of
reflector lamp for use with a
special type of reflector
luminaire. The reflector coating
on the top halfsphere of the lamp
prevents any direct forward light
from the filament and reflects it
backwards onto the luminaire
reflector. The two reflectors
control all the light so there is
virtually no spill light outside
the beam. Spotlights using this
principle cause the minimum
distracting glare to persons
viewing or passing the display
area.
These lamps use the same bulb
shape as gls lamps except for the
40W version which uses a smaller
bulb of "lemon shape"
hence the reference LS45.
Figure 4.11. Crown mirrored
lamp in luminaire.
Figure 4.12. Crown mirrored
lamp shapes.
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