High Pressure Sodium and Metal Halide Lamp Control Gear
GEC / OSRAM / Siemens
Z1885 ballast for 400 W lamps. Notice that an ignitor is shown on the circuit diagram, but only as a dashed line. This is because GEC's own SON lamps (known as 'Solarcolour') included their own in-built ignitors at the time; if using lamps without the internal ignitor, an external ignitor had to be connected in parallel with the lamp.
Siemens BSH400-P SON/MBI ballast from 1993.
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