louver 78 can be slid over so that its neck portion 77 fits around the neck 73 and the shoulder formed by the recess 78 rests on the shoulder 72 to form the louver extending outwardly from the sleeve 70a the lower sleeve at 70a has a sleeve 70b stacked on top of the louver 75 utilizing the internal shoulder 84 fomred by recess 83 in the bottom of each of the sleeves the shoulder 84 then rests against the upper edge of neck 73 to make a tight fitting stacked louver and sleeve assembly the louver 75 is held in place by the next higher sleeve 70b as a further variation a sleeve 70c can have a lower edge that forms a peripheral flange 86 that is of the same length as the neck 73 of sleeve 70b from the shoulder 72 to the outer edge and two or more sleeves 70b and 70c can be stacked on top of the other as shown in fig7 so that a lamp enclosure can be made with no louvers or the space between the adjacent louver 75 can be altered as desired each of the sleeves 70a 70b and 70c can have the serrations or striations that will bend the light rays as desired to form the desired pattern because the louvers 75 are made independently of the sleeve portions 70 they can be made of a different material or can be made a different color and they can be easily molded and assembled generally speaking the sleeves 70 will be a clear prism sections while the louvers 75 will be molded in a desired color or painted the space indicated at 90 between the flange 76 of the louver and the outer surface of.