Questions on Lighting

hi ive been glowing for a little while but always been from seed,when iv done them iv just left the lights on(400w metal halides)now iv got mother plants will i get better results from doing 18/6?i see size but will things move a little quicker by letting them rest?thanks for any posts

thats an age old question i prefer 18/6 to give the plant a rest period and also save on electric truth is theres not much difference between 18/6 and 24hr at all.