fan leaves being your biggest leaves which means the plant gets most its photosenthisis , and also your lower fan leaves store the plants food and carbs.. i wouldnt trim in flowerin unless u really had to for example 1 of the buds was not getting any light
Thanks for the info everyone. I'm growing in a small grow box with a 250 Watt cfl and have a complete canopy and the bottoms of them are starting to look starved for light. I will try and just tie them down for now and see if things improve. I would add more light but my cab is only 23 x 18 so I cant fit a 2 foot strip light or anything for the lower section like I planned.Yep, bending and moving leaves is much better.