Ключевые слова: background, blue, blue background, blue sky, bright, city, color, concept, day, ecology, efficiency, electric, electricity, element, energy, environment, equipment, illumination, lamp, lamppost, lantern, light, metal, natural, nature, night, outdoor, pole, poles, post, power, public, safety, science, shine, sky, sky background, source, steel, street, street lamps, street light, streetlamp, streetlight, technology, urban, view, white,