eeee you can effect the highs buy harvesting to early or late. the tricomes and thc glands mature and decompose it effects the high. sea of green is meant for clones and potiency is genetic it cant be changed just less yeald, read up i recomend the CANNABIS GROW BIBLE it will answer ALL you question! a 250 watt will work if ventilation is a problem but if you can find a way to vent go 400 it will increase yeald. and 'Flowering Time - 56 days' is the breeders recomend flowering time under there growing conditions, you have to be the judge for yourself. indica plants can triple in size thought the flowering process so a 1 ft plant can end up 3 feet, and sativa can exceed 6 times its veg size, so consider pot size plant size space between light and light hood space. lots of the info posted on the internet is hersay and copyed info that might have been wrong in the first place. buy books the breeders know what there talking about!