Heh...i don't think they'll grow too sufficiently in 3 hours of light. For veg outside they should be at least 6 hours i'd say of direct light and 12 of light. Ummm so i dunno, try it out i guess. If there's something you can do like put mylar ons omething to reflect more light giving it more direct light it'd prolly be better.
For mylar you can go get like one of those blanket thingys from walmart for like a $1.50 ..anyways hopefully that helped ya bro, take it easy and good luck!
~Burn One~
Dewayne