in a way your right, to be honest though for veg color spectrum doesnt matter to much if your only using one spectrum. I've vegged under all red b4(couldnt find any blues around here first grow) and all blue b4 and really their is no difference in the end. However i have found a mixed spectrum outperforms using just one of them. I dont really worry bout ratio too much but i'd go for 1 red for every 2 blue(so if you were using 3 bulbs it would be 1 red and 2 blue, for six 2 red and 4 blue) for veg and the other way around for flowering.(1 blue for every 2 red)