Philips Master GreenPower 600W / 400 Volt HPS Pro EL LampThe First Choice of Professional Horticulturalists The Philips Master Greenpower lamp is known as one of the best performing 400v lamps out there. It's heavily utilised by professional horticulturalists in the commercial food growing industry, which is largely down to its ability to pile on weight during the bloom phase. When used with the right system, this lamp will outperform pretty much any other 600w lamp out there, and it will last for