Method Seven Coup HPS Plus Petrol Blue Limited Edition Grow Room Glasses Limited Edition Petrol Blue frame plays with light to appear anywhere from very dark to very bright blue. The perfect holiday gift for your favorite grower! Method Seven patent-pending Rendition lens technology was developed using mineral glass and rare earth elements so people who work under the harsh conditions of high pressure sodium (HPS) lighting can protect their eyes and see the full range of natural colors. Silver+ mirrored exterior fnish improves performance indoors under double-ended HPS bulbs or 10,000 watts, for the brightest of grow conditions and crossover use outdoors as sunglasses. Registers perfect color balance under HPS lights. Antireflective interior coating. 100% UV protection. Lightweight Coup frame features Flex hinges for superior fit and comfort.