yup in the summer, I found running the 315s got me the magic 25c canopy temps, while i managed to keep my root temps to under 23c even on the hottest days. I find if i can keep the environmental close to right, my plants will just grow, to potential. Thats madberry I just pulled was a jack pheno, ran 11 weeks but dam she is top class mate, and super weights of her. I was flipping the lights based on the weather outside, so some days got full 630 but more often 315. I have a tally somewhere to show the split of time on each setting.
having the two lamps also allows me to use the bluer lamp for 8 out of 12 for example. So i run red at dawn, red at dusk, red and blue through the bulk of the day, so mimicking the sun or trying too :)