is it safe to switch between cfl and natural sunlight often?

yea it should be ok longs day temps dont get too low also watch sometimes plants can shy away from strong sun leaves will turn away etc
 
But, other than that, like frmrboi said just make sure your total number of hours stay the same and you'll be fine,
 
I was running my lights and putting her outside on a 24/7 schedule with the outside time from 7:30 a.m.-3:30 p.m. (8hrs out 16hrs in)she looks great to me I topped her at an early age and she's at 18" high started showing pre-flowers so I slipped her into darkness with a 12/12 regiment,beginning yesterday. your interested I'll post you a couple of pictures of her.
 
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