The WH type searchlight is a manually controlled searchlight, operated below deck from within the wheelhouse. The WH searchlight is installed through the wheelhouse ceiling watertightly.  The WHS type is a relatively cost efficient searchlight version, which is also chosen because it allows for an accurate and quick operation by hand directly from within the wheelhouse. Compared to the WS type, the WH type has a higher column on top of the wheelhouse, enabling it to overcome the ships safety rails or any other objects that could obstruct the light bundle radiated by the searchlight.