Flowering, blue/red ratio?

Im 1 week into flowering and using 2x 125w blue envirolites, im wondering whether to put the red in there and keep the 1 125 blue as well. How important is red light this early on in flowering? It's just the blues are more efficient than the reds (I've heard). I was going to keep them like this for another week, but now im doubting, any thoughts?

i keep the blues running for the first 3 weeks of flower the phase to minimise the stretching. after 3 weeks i change to all reds. there wouldn't be much point keeping one blue as each plant wouldn't be getting some red and some blue. it would be some plants would get all red and some plants would get all blue and the ones under the blue would suffer