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