Sciencetech 75W Mercury Light Source Manual
Page 3 of 13
1.
Introduction
St-series mercury lamps are stabilized by the geometry of the gas discharge, resulting in an
accurate position of the arc. As a result, the noise is very low - in the order of 0.1%. The most
favorable values of drift and noise are achieved when only the middle part of the light arc is used
as the light source.
The normal operating life for all St-lamp types is 1000 hrs with a reduction of the output of max.
50%. The normal useful operating life can be between 2000 to 4000 hrs. St-lamps should be
mounted with the base down and an inclination from the vertical of less than ±20°. In DC
operation, the lamp must be connected so that the anode is at the bottom.
