Ключевые слова: background, black, blackboard, bright, bulb, chalk, conservation, copy, creativity, economical, electric, electricity, energy, equipment, fixture, glass, glowing, hanging, holder, idea, illuminate, illuminating, incandescent, innovate, innovation, inspiration, invention, kilowatt, lamp, light, luminosity, power, save, shine, space, technology, text, transparent, tungsten, warming, watt, wire,