On the landing are often burned out light bulbs. Consistent with the normal 75 watt light bulb coupled semiconductor diode D226B (for 400 volt). Brightness decreased, and the bulb lights flicker. Life of the bulb increased. To further increase the life of the bulb and reduce flicker when the diode in parallel with the lamp plugged Paper Capacitor 0.25 mkF 400 Volts. Lighting for the stairway is not bad.
