the higher the lums ie, HPS 1000watter will give u some nice dence buds. compared to 1000 watts of floro. HPS gives out more lums per watt. an is by far better to use for flowering. from what i have been told by evey grower on this site is if i want dence buds use HPS ligthing. floro will not give me what i am looking for that is why i am useing 3 150 watt hps. an plan on adding another for 600 watts. thats 64000 lums. (my 150's are 16k lums each) 600watts of floro would not even come close to that. all the nuits in the world can't make up for light bro.