Ключевые слова: background, bulb, candle, concept, conservation, cooler, creative, different, digital, electricity, energy, equipment, evolution, flame, fluorescent, glowing, holder, idea, illustration, innovation, innovative, invention, lamp, led, light, lighting, obsolete, old, old fashioned, power, progress, progressive, red, save, socket, source, technological, technology, thought, tungsten, vintage, watt, wattage,