im currently growing in a 80,80,160 grow tent under a 250 watt light, going to change it to 400 watt HPS for flowering. dont think grow tent big enough to let it grow bigger so going to start flowering. thx for ure help!!!White Widow is a sativa and will get tall fast, depending on your setup and available space is the factor you must keep in mind. White Widow takes about 10 week of flower to finish, I started flowering at around 3ft (36in), at the end of 10 weeks it finished a little over 5ft. as the poster stated above growing them beyond your space will waste your time and hurt your yield. Hope this helps any, post some more info and ill take a look to see what I think.