Outdoor then Indoor Stress?

Would it stress a plant out if I were to throw her outside during the day when its bright out, and then bring her in and put her under a 400w mh when its dark out??

Stress might occur, limit it with a safe distance of plant and bulb. At a distance that heat is not a factor, should be safe. Some light is better then none, your right to be cautious.
I do this with two 105w CFL 6900 lumen each, not quite the lumens or heat, the 400w mh produce.

K thanks. Btw, I like your avatar. I did some aztec art like that in 8th grade and it looked awesome!

Try to match the temperatures. Don't go from 50's outside to 80's indoors. That will stress them for sure.