Sodium lamp for 0.75 - 1 m²
HPS high pressure sodium lamps are a very efficient source of light for indoor gardeners. The light radiates strongly, so the sodium lamp can penetrate the foliage of your plants. High pressure sodium lamps give a more natural light and a more continuous spectrum. The efficiency is 8500 to 13000 hours. A HPS 400W sodium lamp requires a ballast or a ballast of the same wattage to operate.