I have three 3 feet long florescent light fixtures in a recessed cavity
in the kitchen ceiling. The cavity is 3 feet by 3 feet by 10 inch deep
made from drywall. The cavity is covered by thin plastic florescent
light covers made for T-bar ceilings. Above the cavity is the attic
with about 10 inch blown in insulation. These fixtures are regular Home
Depot fixtures and are paralel to each other about 10 inches apart.
They are all supplied from the same junction box also in the cavity.
Problem is that they get so hot that the thermal safety in the fixtures
trips and shuts off the fixtures. This happens after a year of constant
daily use. First time it happened, I replaced all three fixtures
because the ballast were leaking out. It is starting to happen again.
This time, the ballast are intact, but the lights still shut off if left
on too long.
Is this to be expected given the way they are installed? The one weird
thing that has me concerned is that the junction box supplying all the
fixtures have an unused red wire. The lights are connected to the white
and black wires. This was the way I found it when I first replaced the
original leaking ballast fixtures. Is there an electrical problem?
What are the possible solutions? Venting the heat into the attic is not
an option since that would bring other problems in the winter.
Any and all input most welcome. Thanks.