Thealuminum reflector(AR) lamp con-
sists of a prefocused axial filament lamp and
faceted aluminum reflector that form an
optical system. With some AR lamps the fila-
ment cap forms a grip for easy handling in
addition to preventing direct glare from view.
Other AR lamps have an integral diffusing
glass lens to modify the beam-spread.
AR lamps are available without lenses in
diameters of 70 mm and 111 mm (figure
6.12) and with lenses in diameters of 37
mm and 56 mm. The AR111 lamp is compa-
rable to the PAR36 lamp size and base and
is used interchangeably with sealed-beam
PAR36 lamps. AR111 lamps also have
excellently designed reflector surfaces.
Withmultifaceted mirror-reflector (MR)
lamps, a small halogen lamp is attached to a
mirror with a surface composed of specular
facets (flood) or a smooth plane (spot)
(figure 6.13). The mirror is ellipsoidal in
shape; the lamp’s coiled filament is placed
near its focus.
This combination acts as an optical con-
densing system in slide projectors, removing
the need for lenses to control the light pat-
tern. By changing the shape of the mirror or
relocating the light source within the reflec-INTERIOR LIGHTING FOR DESIGNERS
Figure 6.11Low-voltage PAR36 and low-voltage PAR56 lamps at one-half
actual size.