Not completely true but usually the case, if you give a plant optimum conditions they can finish earlier than the breeder says but its not just the light its everything temps, airflow, hydro/soil and many more factors if you are doing things exactly right they can finish weeks ahead of the stated flowering times, especially the long flowering sativas, I think super silver haze states that it is 14 weeks but they can finish in as little as 10, i have seen this. Mostly they do grow quite accurate to the stated times tho, sorry just thought is say it aint unheard of for them to finish up earlier then they tell you. Nice1depends on what strain it is , not what or how many watts u have on em' ...
"space bombs"... was that neccessarry? lola 400 watt isnt necessarily going to increase the flowering time for your plants versus a 250 so to speak. think about it, buds develop because of 12 hours of darkness, and when they do have light, you want to provide them with the best light to develop superior quality buds. strain and genetics is 90% of it. space bombs take 45-55 days to flower, where some sativas take 75-85 days.