They work.. I used the no name brand china 1000W digital ballast for like 4 years, so they work but they dont compare to your good brands like Phantom, LumaTek , Galaxy etc .. I mean the good ballasts and light equipment are just so much better you can tell with your own eyes. However the no names are a cheap easy way to start and learn how to grow but if you plant to be in this for the long run then I would just invest in some good equipment.