[Mpeg-database-milestone] N appreciable amount of the value of the radiant

[Fehlinger <unr...@on...>]

E, and red in the order of increasing wave-lengths. Electromagnetic
energy radiated by a light-source in waves of too great wave-length to
be perceived by the eye as light is termed as a class "infra-red radiant
energy." Those too short to be perceived as light are termed as a class
"ultraviolet radiant energy." A solid body at a high temperature emits
electro-magnetic energy of all wave-lengths, from the shortest
ultra-violet to the longest infra-red. Another complication arises in
the variation in visibility or luminosity of energy of wave-lengths
within the range of the visible spectrum. Obviously, no amount of energy
incapable of exciting the sensation of light will be visible. The energy
of those wave-lengths near the ends of the visible spectrum will be
inefficient in producing light. That energy which excites the sensation
of yellow-green produces the greatest luminosity per unit of energy and
is the most efficient light. The