Yes, heat can be a real problem in recessed lighting fixtures. I'm not sure what the "pot" light you referred to is, but a common circular recessed fixture is caled a "can" light, and they are sold in "IC" and "non-IC" ratings. That stands for Insulation Contact and it usually means that the fixture has a built in thermal breaker to protect against overheating; and is UL rated for direct insulation contact. Another factor to keep in mind with light fixtures is the recommended maximum bulb size. Just a thought....I have placed dimmer switches on all of my recessed can lights and hardly ever operate them on maximum brightness. This greatly extends bulb life, and reduces heat build up in the fixtures.