basics to follow when using latest gen diodes (Samsung lm301b or lm301h, Bridgelux EB3, etc)
Veg - 15-20w per sf - 4000 to 5000k is usually best. "cooler" blue spectrums help keep the plants short and bush out, and keeps the internode length short
Flower - 30-40W sf - 2700k to 3000k is ideal...