Electronic Ballast Suitable for MH & HPS lamp Energy saving up to 20% Lifespan: 50,000 hours 110-220V, 35W, 50W, 70W ... at 150Hz with square wave Prolong lamp lifespan at least 10% Energy saving up to 20% compared with magnetic ballast Good ... intelligent control hot-start, immediately shutdown if the ballast fails to ignite lamp in 30 minutes, excellent ground protectionSpecification: Power: 35W, 50W ...