Lamp for illuminating an outside signalling or indicator panel, e.g. on railways, has foam block and outlet orifice to remove condensation and moisture

摘要

The lamp has a light source in a housing made from two sub-assembles (1, 2) in the form of upper (10) and lower (20) extrusions fitted together with seals (5a, 5b), and contains at least one component (7) to prevent the formation of condensation and the presence of moisture inside the housing. The component comprises a block (70) of foam with open cells and an adjacent outlet orifice (9) in the lower part of the housing. The orifice also balances the pressure inside and outside the housing.