First time L.E.D. Question

Ok my set up, 4x8x72 mars tent, 1 900w 2 600w MEIZHI L.E.D. lights, 6 plants in D.W.C, 3 @ 4 weeks in 2 1/2 gal buckets and 3 @ 7 weeks in 5 gal buckets, my question that I have not been able to find an answer for, should I flower in dual spectrum or only flower mode, if only flower mode should I use dual spec till they finish stretching then flower mode only
thanks for any input
SBH
 
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