what are you opinions with these double ended hps bulbs and set ups like the gavita do they really preform better then the old school screw in bulbs ? on paper they may look better and with out glass the numbers will always be higher . but in the real world how do they work ? solis tek and now hortilux make double ended bulbs . is it worth spending the extra cash for this upgrade . i currently burn solis tek ballasts my bulbs are a year old its time to buy bulbs . thanks guys and ladies .