I have a number of them.. most of them are 600w with 10w epistar chips.. they come from a number of manufacturers.. If you are looking to buy one I would buy "up" about 20%. For example - the space this grow is in used to have a 1000w HPS - now it has 2 600w leds (total of 1200w). Its a lot harder to burn your plants with LED so the extra power has its advantages!