the flak searchlights used were developed in the late 1930s and used 150-centimeter-diameter parabolic glass reflectors with an output of 990 million candelas. the system was powered by a 24-kilowatt generator, based around a 51-horsepower (38 kw) 8-cylinder engine, giving a current of 200 amperes at 110 volts. the searchlight was attached to the generator by a cable 200 meters long. the system had a detection range of about 8 kilometers for targets at an altitude of between 4000 and 5000 meters.