China manufacturer of magnetic ballasts for metal halide flood lights & hps flood lights

Fluorescent ballast in the -40 (continuous temperature) can work normally. But the fluorescent tube at -40 degrees can not start. The fluorescent tube is evacuated, then filled with a small amount of inert gas and mercury, the inner wall of the tube is coated with a layer of fluorescent powder. At both ends with preheating tungsten, tungsten coated with barium and strontium can because of the heat emission of electrons. When the temperature of tungsten oxide reached 950 degrees (power at both ends of the lamp tube, the luminous) coating surface oxide emission free electrons, starter disconnects instantaneous high voltage between the electrodes at both ends, ionizing inert gas arc is formed between the tube (the lamp lit, we called it" startor"), the starting temperature increased after lamp, mercury heated and gasified, mercury vapor ionization conductive, the arc is maintained, produce ultraviolet light, ultraviolet light tube fluorescent material emits visible light. The ambient temperature is too low in mercury lamp is not easy to be ionized, so it can't start.