Light devices “Signal-N” and “Signal-B”, which are included in the set of light device “SIGNAL”, are intended for visual detection of the returning compartment of the spacecraft descent vehicle in the dark and in difficult weather conditions.
The devices emit light pulses within a hemisphere no more than 10 seconds after the supply voltage is applied and ensure the visibility of the light signal at night with an atmosphere transparency of at least 0.85 at a distance of at least 20 km.