I have a new 12/2 running back to the breaker panel on a 20A breaker. It is too short to reach the first ceiling fixture. Is it okay to put an accessible junction box in the ceiling? I will be installing 4 fluorescent fixtures with 4 T8 32W bulbs- total 16 bulbs and 3-4 outdoor wall sconces with LED bulbs totaling about 60W? and wall switches of course.