Theatre Design & Technology - Oct 1972 - 15

1/100 A. U. -5 mu

100 m-300 mm
300 mm-30 km
5 Au-400 mu 700 mu-400 m

X-Rays

E-<

..,
 .~
..,

.....

to to
~

Radio & TV

..,'0

Gamma Rays

5~

Waves

Hertzian Waves

400 mu-700 mu
1
1
1
1
1

Au=1/10. 000 mu (millimicron)
mu=1/1 , 000 m (micron)
m =1/1,000 mm (millimeter)
mm= 1/1 0,000 m (meter)
m=1/10,OOO km (kilometer)

The Electromagnetic Spectrum
Figure 1

Upon examination of the forms of radiant energy illustrated in Figure 1, it can be seen that the band of wavelengths of light is extremely small in relation to the total
electromagnetic spectrum, 1/60 of the entire spectrum.
This band which lies between the ultraviolet and infrared
radiations is known as the visible spectrum for the obvious
reason of reception of the wavelengths of this area by the
eye. The human eye is a highly specialized instrument
designed to receive and respond only to a certain segment
of radiant energy waves (the visible spectrum) just as the
radio is designed to pick up only radiant energy of certain
longer lengths called radio waves. It is relatively insensitive
to any other form of radiation which may be received by
other animate or inanimate objects.
Regardless of light source, we generally consider the
light illuminating what we see as "white light". Artificial
sources providing light at night appear just slightly different from the quality of daylight. Yet one can fully
appreciate the color difference between artificial light and
daylight by comparing the distinctly yellow appearance of
an artificial illuminant with the white cast of daylight. Sir
Isaac Newton showed us many years ago that the quality
of white light resulted from a mixing of all wavelengths of
the visible spectrum. This was possible because each wavelength, slightly longer than the next, could be bent at a
different angle when passed through a glass prism. To
prove that white light emanating from light sources was in
truth a combination of all wavelengths, Newton passed a
beam of light through a prism and in the bending of light
rays, separated each of the spectral colors. Hence, we
learn from Newton's experiment that the color quality of
a source depends upon the amount of each wavelength of
the visible spectrum inherent in it. The white light generated by light sources then is composed of varying amounts
of red, orange, yellow, green, blue-green, blue and violet.

~ THEATRE DESIGN AND TECHNOLOGY

OCTOBER. 1972

The limits of the visible spectrum lie between 380 mu
and 750 mu but for most measurement studies a range
from 400 mu to 700 mu is employed. The subdivision of
the spectrum is an arbitrary procedure because wavelengths vary continuously from one end to the other. The
spectral colors comprise the following ranges:
Violet
Blue ..
Blue-Green
Green.
Yellow
Orange
Red ..

400-450
450-490
490-500
500-570
570-590
590-610
610-700

mu
mu
mu
mu
mu
mu
mu

The spectral energy distribution of light sources also
play an important part in measurement studies.
A given color must be related to the illuminant under
which it is seen. To establish standard specifications for
illuminants, scientists have experimented with light
sources known as black bodies. These light sources when
heated produce a color dependent only upon their temperature not upon their composition.
The black body is a hollow metal enclosure which can
be heated to a high temperature. When the temperature
within the enclosure is sufficiently high, the inner walls
will emit light. Since each wall is the same temperature no
heat is lost and this light is radiated in all directions from
every point. All parts of the interior are receiving and
emitting light in equal amounts. If a small opening is made
in the enclosure, the amount of light equal to that received by the interior wall will pass out. This light will be
of a particular color depending upon the temperature
within the enclosure.

15



Table of Contents for the Digital Edition of Theatre Design & Technology - Oct 1972

Contents
Theatre Design & Technology - Oct 1972 - 1
Theatre Design & Technology - Oct 1972 - 2
Theatre Design & Technology - Oct 1972 - 3
Theatre Design & Technology - Oct 1972 - Contents
Theatre Design & Technology - Oct 1972 - 5
Theatre Design & Technology - Oct 1972 - 6
Theatre Design & Technology - Oct 1972 - 7
Theatre Design & Technology - Oct 1972 - 8
Theatre Design & Technology - Oct 1972 - 9
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