The Philips Greenpower 600 Watt / 400V Lamp can produce up to 8% more growth light than a non-400V 600 Watt Lamp! Recommended for 400V ballasts.
• A superb lamp, specifically for use with Pro HPS 600W/400V lighting systems only
• Produces the most umols (plant usable light) of any 600W lamp for flowering
• Biggest yielding lamp 600W HPS lamp available
• Lasts for up to a year