Abstract: A housing for a lighting fixture is provided such that the fixture has IP65 or better impermeability. The housing includes a base pivotally connected to a lid, the lid including a light permeable diffuser, a pliable gasket between the lid and base, and fastening means including a fastener on the lid and a flange on the base. The flange is provided with a linear cam portion diametrically opposed to the pivot, and an opening defined in the flange, such that when the lid is pivoted to proximity with the base and the fastener is tightened, the distal end of the fastener will contact the linear cam pulling the lid into sealed relation with the base. The fastener being tightenable such that its distal end enters the opening in the flange, thereby locking the lid onto the gasket and base to form an IP65 impermeable relationship.