Stretching

What causes bud stretch in a outdoor plant I have a sativa growing outdoor since its summer I take it out at 6.00am then bring it inside and cover it at 18.00 my problemi buds are growing nice thou I over fed it but they are stretching and they are nice thick where they started but they have long tips with hairs and froming new bud leaves they are going up wards

videoman40 said:

Lower bud sites that are not illuminated sufficiently will produce under-developed buds: airy or popcorn bud. Popcorn buds have lower dry weight, take much longer to trim, and often have less bag appeal.
How can I minimize stretch?
Note: Some of these techniques only apply to the stretch phase.
Use a compact strain
Indicas tend to have minimal stretch growing characteristics in flower compared to tall-growing Sativas. Hybrids may grow unevenly, or react to stress unexpectedly.
Keep light at the optimum distance
Low light levels will cause seedlings and plants to stretch and produce poorly.
from: http://www.hrt.msu.edu/course/HRT100/lec8.htm
“….High light inhibits plant growth - plants tend to grow taller when there is less light."

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Lots of good info in the post. But this part is forum bunk. Popcorn buds are the result of hormonal distribution. Not lack of light. Outdoor plants produce the very same popcorn.
http://cannabis.com/faqs/growing/blooming-what-is-stretch-and-how-can-i-minimize-it.html