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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
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 wher<