I have to agree with ub that the fan leaves are important to keep on your plant. I used to take off the fanleaves, thinking that the bud sites need light to grow. They really don't. In fact I found that leaving them on actually created fuller buds.
Now having said that, I grow LA confidential, and the breeders at DNA Genetics actually advise you to remove fan leaves later on in flower to allow light to reach the lower buds. It's hard to argue with these guys about their own strain.
I did a side by side experiment on two plants that were lst'd and kept quite low profile. I left all the fan leaves on during the entire grow. I had bud growing right down literally into the perlite. Now,I removed the fan leaves on one LAC one week before harvest, and left the other one alone. I found that the control plant ended up with great dense purple buds on top and light green nugs below the canopy. the other plant ended up with the same size nugs, but these buds were denser and more finished than the control plant.
The conclusion I reached is that, the fan leaves are necessary for your plants overall health and serve a very important function in bud development as energy source.
Once the buds have fully developed,ie to the point that no more pistols are produced and have mostly died back, the resin glands are mature, then I feel the fanleaves have served their purpose and can be removed to allow the lower buds a chance to finish, without the need to multi harvest the same plant, when I could be revolving another plant into the flower room.
In the end, the plant with the fanleaves removed, resulted in higher yield because the lower buds were able to finish, thus being denser.
My two cents....
Your thoughts?