eh..both is important..I haven't grown enough flowers to comment much on it, but myself believe it's important to get sufficient light to the bud sites without big fan leaves blocking the light, however still making sure you're getting light to the leaves, because I do agree that they perform photosynthesis and convert a lot of light to energy..Really hard for anyone to be correct I think..but I voted bud sites...my primary focus is the bud sites, and the leaves directly on those bud sites..the fan leaves on them..those leaves are probably making nice good energy for their corresponding bud sites..however, I can tell you that buds that get more light on them do grow bigger...I'm going through this right at this moment actually..I'm kinda stoned so I don't know how much sense this really makes..