Ключевые слова: bill, bright, bulb, cheap, clear, clever, concept, conservation, conserve, creative, curly, current, electric, electrical, electricity, empowerment, energy, environment, eureka, expense, florescent, fluorescent, gas, glass, glow, good, idea, illuminate, illumination, inspire, invent, light, lightbulb, luminance, money, power, save, savings, shine, smart, solution, solve, spark, think, thought, thoughts, ultraviolet, white,