You will have to acclimate them to sun. The best way is to put them out in the after towards evening when the sun is weak. each day increase the amount of solar uv the plant gets. start about now only when temps are above 60F. do not leave out over night or the roots will cool down to much and will cause leaf stress when the sun hits the leaves the next day. Could you post pics. I like seeing what other's trees look like.

check out mine at this link by clicking on the picture below

{{gwi:569382}}
MEIWA KUMQUAT TREE GROWN FROM SEED

FOR SLIDE SHOW CLICK LINK BELOW

Here is a link that might be useful: http://s1094.photobucket.com/user/wreristhechimney/slideshow/Seed%20grown%20Meiwa%20kumquat%20tree