I'll play Devils advocate here ..
I grow CFL's.. and only a few low plants, so it is easy.
But in the last few weeks before harvest, weather permitting, I try and get them several hours of window sun and they love it and it seems to really pull everything together for the final count down.
I also veg my replacements in the same 12/12, so I move them out each night and back in the morning by hand, often if the sun is coming through I just stick em in the sill for the day.
Been doing this for a long time.. no concerns as long as I keep control of the plant and don't start smashing it into things or getting it caught on stuff which is a reason right there to NOT do what I am saying.. but it works for me in my situation.
I probably wouldn't do it in Southern Az in the summer when the sun might just fry em.. but up here in the mountains where I am at, it works real nice, especially to finish a harvest off.
Peace~!