Railway signal light source

The utility model provides a shake-free solid-state LED railway signal light source with long lifetime, the signal lamp is formed by a plurality of power LED chips bonded on the heat conduction substrate equipped with PCB with heat conduction glue, and packaged by infusing insulated flexible glue, a paraboloid reflector is disposed around the LED chips, the outside of which is covered a transparent lens; the heat conduction substate is bonded with heat conduction glue directly to a flat heat tube bonged to metal aluminium base with heat conduction glue, or bonding the substrate directly to metal aluminium base, the electrode of LED chip is extracted from the aluminium base; a plurality of LED chips are packed on the heat conduction substrate equipped with PCB, wherein P, N pole are in series; the heat conduction substrate is copper plate or ceramic plate. The utility model is superior in shake-free, low costs and long lifetime.