Sodium Ballast Sodium ballast, 35W VK/NAH/35 Sodium ballast, 70W VK/NAH/70 Sodium ballast, 100W VK/NAH/100 Sodium ballast, 150W VK/NAH/150 Sodium ballast, 250W VK/NAH/250 Sodium ballast, 400W VK/NAH/400 Sodium ballast, 1000W VK/NAH/1000