thats for them greenpower bulbs innit,anyone alse looked at the gavita pro 600?.....was hoping they drop a bit in price......http://www.ebay.co.uk/itm/Amazing-Gavita-Pro-600-electronic-ballast-90-000-Lumens-giving-8-more-light-/170989007977?pt=UK_HomeGarden_Garden_PlantsSeedsBulbs_JN&hash=item27cfbd3469
says 90k lumens giving 8% more light, well a nomrla hps gives out 90k so wtf is that about? typo?