strain figures into it, heavily ... sativas tend to have fluffy, light buds, indicas can have anything from dense colas, to golf-ball type buds ... available lighting has a great deal to do with it ... 400 watts of high-pressure sodium, is vastly better than 400 watts of cfls, etc ... everything comes into play, from the rootball, to the temperatures, menium, etc. ... to get the big 'magazine-photo' colas, you need to get all your ducks in a row ... happy gardening ! :thumbsup: