if you run them same time the plants WILL ALWAYS lean toward the blue spectum light over head. R u gonna use them both for vegg and flower? The blue spectrum will not do much for the flowering of your plant except extra heat. I got only 12grams off a 4 foot plant only using the blue to flower but then i used the red and got over an ounce so im my eyes it would be a waste of electric to use any red for veg and any blue to flower. ...peace