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Electrical Applications 2 by David W. Tyler

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Illumination 123
except that there is no auxiliary electrode; starting
is
by high-voltage
impulse, as in the sodium lamp.
The high-pressure sodium lamp
If the pressure in the sodium lamp is increased and the temperature
raised to about 1000°C, the discharge becomes much whiter and
blends well with light from normal incandescent lamps. This
development could not take place until a new material for the tube
had been developed. The low-pressure lamp uses a glass tube while
this lamp uses an aluminium oxide (alumina) tube which is capable
of withstanding the very high temperature. It is used extensively for
floodlighting where the warm, slightly pink