Ключевые слова: background, bright, bulb, business, choice, clean, concepts, conservation, currency, economic, economical, efficiency, electric, electricity, energy, environment, environmental, equipment, filament, fluorescent, fuel, generation, glass, ideas, illuminated, inflation, investment, isolated, kilowatt, lamp, light, lightbulb, lighting, money, motivation, nature, power, priority, saver, savings, supply, tungsten,