light cycle wont hurt it none as long as its as many hours light inside as it was outside or better speaking 24/0 or 18/6. but if i were you i would more worry about hurting the roots be very careful while doing this procedure . i would dig 3 times as wide as the plant is and twice as deep as the plant is long . and be very careful but you can do it just like a baby water maple the roots grow out wide.
You can try to introduce them at a similar time as to when they would normally get the light,and messing up roots can be a problem if it's not in a pot. Is it something special or bagseed? You might be better off starting some more and avoiding potential pest problems from the outside environment/outside soil.
I had my plant growing outside in the ground for 5 days when I finally wnted to move it in. All I did was get a big spoon and scooped it up and placed it in a cup. I set it up by the window seal for a couple of days to try to introduce it to the indoor enviorment and tempeture. I isolated it by it's self to check for pest with a 42 watt CFL in my closet once I saw no pest I moved it into the grow box, had great success.
this dude could have a 2 foot plant outside as far as we know . i myself have a five footer outside right now. but its from my indoor grow and its about 3 months old and only been outside for app. 2 weeks now and i tell you what i would hate to try and dig it up with just the 2 weeks growth behind her belt .
everyones's situation is different, I wouldn't recomend anyone to dig up a 2 FT. plant up. I thought his plant was barely sprouted or had a few days grow'n, only then would I recomend anyone to follow what I said. Sorry if I confused anyone.Good luck on yo grow blueberry yumyum.