[ TRACKS, BRACKETS, HOOKS, CHAINS AND WIRES FOR MOUNTING LIGHTS ]

[ TRANSFORMES, INDUCTORS, POWER SUPPLY UNITS, AND LIGHT CONTROLS ]

[ ELECTRIC, INCANDESCENT, GAS DISCHARGE AND FLUORESCENT LIGHTS AND LAMPS AND PARTS THEREFOR, LAMP SOCKETS, ] BALLASTS [ , STARTER AND IGNITERS ] FOR GAS DISCHARGE LAMPS [ , CONTROLLED LIGHT-GUIDING LOUVERS, VENTILATORS AND PARTS THEREFOR, AIR-CONDITIONERS AND PARTS THEREFOR, AND HEATERS AND PARTS THEREFOR, ]

[ PLANNING AND DESIGNING PLANTS FOR ILLUMINATION, AIR-CONDITIONING, VENTILATION, AND HEATING, ]