Ключевые слова: black, bright, bulb, concept, daylight, discovery, eco, economic, edison, electric, electricity, energy, equipment, filament, glass, glow, great, green, heat, household, idea, illuminate, imagination, innovation, inspiration, invention, lamp, light, power, saving, science, supply, switch, technology, transparent, trun on, tungsten, voltage, warming, watt, white, wire, wood,