Theatre Design & Technology - May 1968 - 22

ELLIPSOIDAL REFLECTOR SPOTLIGHTS The ellipsoidal reflector spotlight provides a controlled beam of light with
typical instruments falling in the 500 to 2000 watt range.
The normal beam pattern of these instruments is circular,
but framing shutters commonly are provided to shape the
beam. Also, this instrument can be used to project patterns of Iight. The most desirable condition is for the unmasked beam to be uniform, so all parts of the unmasked
beam can be utilized and all mask settings are functional.
Figure 5a shows the typical pattern produced by a standard
ellipsoidal reflector spotlight. The dark areas at the top and
bottom of the pattern are caused by the large hole required
in the reflector to admit the lamp and by the lack of light
emitted from the end of the lamp. Figure 5b shows a more
desirable pattern for such instruments; this can be obtained
by a new optical design. Figure 7 illustrates an adaptor for
use In the ellipsoidal reflector spotlight to permit the use of
500 through 1000 watt tungsten-halogen lamps in existing
fixtures. The performance with such substitutions is shown
in Fig. 8. It is seen that improved performance can be obtained even with increased life. The necessity for proper
alignment of the lamp in this type of instrument is evident.
Panerns approximating those shown in Fig. 5b can result
from misaligned lamps; the hot spot will not always be cen·
tered in the pattern. The need to realign the fixture each

Figure 7. Adapter to permit the use
halogen lamps in existing equipment.

a.

of single-ended tungsten-

b.

Figure 6. Light patterns of ellipsoidal reflector spotlights. (a) Conventional unit showing dark areas caused by lamp orientation. (b) De·
sign utilizing single-ended tungsten-halogen lamp to produce axiallysymmetric pattern.

time a lamp is replaced becomes a major factor in the use
of this instrument type. However, the problem is common to
IJoth the tungsten-halogen lamp and the standard incandescent lamp.
A fixture design to improve the performance of this instrument is shown in Fig. 9; the optical system is shown in
Fig. 10. A small, compact coil, single-ended tungstenhalogen lamp is placed axially in the system. The elliptical
reflector efficiently collects the light from the filament and
images it at the aperture; here it is focussed by the lenses
into the spotlight beam. Very uniform beams can be obtained from this form of system since the hole in the reflector to admit the lamp, and the lack of light from the
end of the lamp are not optically involved in the system. A
50 per cent gain in lumen output can be obtained with this
system.

22

THEATRE DESIGN AND TECHNOLOGY



Table of Contents for the Digital Edition of Theatre Design & Technology - May 1968

Contents
Theatre Design & Technology - May 1968 - 1
Theatre Design & Technology - May 1968 - 2
Theatre Design & Technology - May 1968 - 3
Theatre Design & Technology - May 1968 - Contents
Theatre Design & Technology - May 1968 - 5
Theatre Design & Technology - May 1968 - 6
Theatre Design & Technology - May 1968 - 7
Theatre Design & Technology - May 1968 - 8
Theatre Design & Technology - May 1968 - 9
Theatre Design & Technology - May 1968 - 10
Theatre Design & Technology - May 1968 - 11
Theatre Design & Technology - May 1968 - 12
Theatre Design & Technology - May 1968 - 13
Theatre Design & Technology - May 1968 - 14
Theatre Design & Technology - May 1968 - 15
Theatre Design & Technology - May 1968 - 16
Theatre Design & Technology - May 1968 - 17
Theatre Design & Technology - May 1968 - 18
Theatre Design & Technology - May 1968 - 19
Theatre Design & Technology - May 1968 - 20
Theatre Design & Technology - May 1968 - 21
Theatre Design & Technology - May 1968 - 22
Theatre Design & Technology - May 1968 - 23
Theatre Design & Technology - May 1968 - 24
Theatre Design & Technology - May 1968 - 25
Theatre Design & Technology - May 1968 - 26
Theatre Design & Technology - May 1968 - 27
Theatre Design & Technology - May 1968 - 28
Theatre Design & Technology - May 1968 - 29
Theatre Design & Technology - May 1968 - 30
Theatre Design & Technology - May 1968 - 31
Theatre Design & Technology - May 1968 - 32
Theatre Design & Technology - May 1968 - 33
Theatre Design & Technology - May 1968 - 34
Theatre Design & Technology - May 1968 - 35
Theatre Design & Technology - May 1968 - 36
Theatre Design & Technology - May 1968 - 37
Theatre Design & Technology - May 1968 - 38
Theatre Design & Technology - May 1968 - 39
Theatre Design & Technology - May 1968 - 40
Theatre Design & Technology - May 1968 - 41
Theatre Design & Technology - May 1968 - 42
Theatre Design & Technology - May 1968 - 43
Theatre Design & Technology - May 1968 - 44
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