The never ending Sativa

I appreciate that this is a CFL only grow in organic soil. I have just started week number 13 into flowering. The only info I have on the seed is that it is a pure Sativa from Thailand. I have very minimal brown pistils and all the Trics are clear. The buds are quite loose ( I expected that with a low output CFL grow). Could anyone hazard a guess on how long I should wait to harvest? Is it possible for a strain to yield only clear Trics?

Pics included.

Kindest Regards.

Tall.

looks nice for cfl's. you got a while still probably 3-4 weeks i'd say. I'd suggest getting as many lights as you can around it and make sure you got the high-wattage bulbs.