Light fixture with improved sealing features

A light fixture for outdoor use comprising:

• a housing defining an interior space therein and having an open end, the housing interior space configured for containing a lamp bulb to shine a beam out of the open end of the housing, and the open end including a sealing face;
• a radial groove formed in an outer surface of the housing proximate the housing open end and rearwardly of the sealing face, the radial groove including a cam surface configured to slope in a rearward axial direction along the housing;
• a retention ring configured for surrounding the housing open end and axially movable along the housing, the retention ring including a retention surface configured to oppose the sealing face;
• a lens configured to fit over the open end of the housing to close the housing and allow a portion of the beam to pass therethrough, the lens having an outer edge positionable between the sealing face and the retention surface of the retention ring for securing the lens to the housing;
• a cam following structure coupled to the retention ring, the cam following structure operable for engaging the rearward-sloping radial groove cam surface and axially moving the retention surface rearwardly against the housing sealing face to capture the lens outer edge and seal the housing.