haha idk man...I'd only assume that if it WERE possible, you'd either need more power OR a pro-longed period of light (i have no clue how long it takes an orange tree to grow to any substantial height).

I've been eating organic seeded oranges all summer so far and I've been thinkin of saving some of the seeds to drop in soil in my backyard...idk how long it'd take to grow tho