when to prune

[steve.442]

when is it best to prune the tipy of our plant, is it before the lights go off or when they come on. also at what internode or wat height is it best to be done so your plant spreads out

[hatecable]

Check this out. I think this is what you are referring to.

Fimming and Topping (http://boards.cannabis.com/grow-faqs/144573-guide-fimming-topping-made-easy.html)