Phlison is one of biggest electronic ballast factory, we have couples of function ballast on hot sale(35W, 150W, 250W, 400W, 600W, 1000W.....), expecially 600W and 1000W, we export more than 5000pcs each month, quality and price are both good. otherwise, if you want any other function, we have professional Research and development team provide technical support to meet your request, please contact me if you are interesting our electronic ballast or need our technical support plsease sent mail to ***** to know detail.