If I had to choose it would be more light in flower for sure. I look at it like this..in veg it's like hughesresearch said, you want to get to a certain size, it's really up to you. If you don't have the lumens to get them there, you can always just let them veg longer. In bloom, it's more or less on a fixed schedule, driven by genetics. So you want as many lumens as possible during that 8 or 10 or whatever weeks.