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A recessed insert fixture uses a housing shaped as a hollow, single piece cylinder that comprises a top and a bottom and starts from the top with an internal, shallow cylindrical cavity and continues downwardly with an internal, deep cylindrical cavity. The interior diameter of the former is lesser

A recessed insert fixture uses a housing shaped as a hollow, single piece cylinder that comprises a top and a bottom and starts from the top with an internal, shallow cylindrical cavity and continues downwardly with an internal, deep cylindrical cavity. The interior diameter of the former is lesser than the interior diameter of the latter. A first annular channel starting from the top is coaxial with the internal, shallow cylindrical cavity. A second annular channel extends radially, proximately to the top, into a wall of the internal, shallow cylindrical cavity. Two O-rings are used. One is inserted into first annular channel. The other one is inserted into the second annular channel. When the fixture is assembled, the first O-ring is compressed directly by a lid, the other one indirectly by the same lid that acts on a flange and surface of a lamp reflector.

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I claim: 1. A housing for use in a recessed light fixture, the latter comprising a housing; a sealing subassembly mounted to said housing for waterproofing it; an electrical light subassembly positioned within said housing; a lid subassembly superimposed on said housing for closing it when said ele

I claim: 1. A housing for use in a recessed light fixture, the latter comprising a housing; a sealing subassembly mounted to said housing for waterproofing it; an electrical light subassembly positioned within said housing; a lid subassembly superimposed on said housing for closing it when said electrical light subassembly and said sealing subassembly are already mounted to said housing; and a fastening subassembly for affixing said lid subassembly to said housing and for securing the latter to a firm member of a in-floor or alike structure; said housing for use in a recessed light fixture having a shape of a hollow, single piece cylinder is provided with a top and a bottom and starts from said top with an internal, relatively shallow cylindrical cavity and continues downwardly towards said bottom with an internal, relatively deep cylindrical cavity, the interior diameter of the former being lesser than the interior diameter of the latter; said housing having also several closed, threaded holes, equidistantly spaced on a circumference coaxial with and between the external circumference of said housing and the circumference of said internal, relatively shallow cylindrical cavity, and disposed between the former and the latter, said several closed, threaded holes extending from said top inwardly into a wall situated between a surface defined by the external circumference of said housing and a surface of said internal, relatively deep cylindrical cavity; said housing also incorporating a first annular shallow channel starting from said top and disposed between the circumference corresponding to said several threaded holes and the circumference corresponding to said internal, relatively shallow cylindrical cavity, said first annular shallow channel being coaxial with the foregoing circumferences; and a second annular shallow channel extending radially, proximately to said top, into a wall of said internal, relatively shallow cylindrical cavity; said cylindrical external surface of said housing being interrupted, adjacent to said bottom, by a flat, relatively small zone, while an identical, threaded aperture being formed, centrally, in each mentioned items, namely said bottom and said flat, relatively small zone, one of said identical, threaded apertures being usually closed by a sealing, threaded plug; and a pair of closed, threaded openings, situated approximately midway between said top and said bottom and located diametrically, extends radially from said cylindrical external surface of said housing into the wall of the latter, said sealing subassembly including a first and second O-rings, said first O-ring being partially inserted into said first annular shallow channel and partially protruding outside the latter, said second O-ring being partially inserted into said second annular shallow channel and partially protruding outside the latter. 2. A recessed light fixture comprising, in combination a housing; a sealing subassembly mounted to said housing for waterproofing the latter; an electrical light subassembly positioned within said housing; a lid subassembly superimposed on said housing for closing it when said electrical light subassembly and said sealing subassembly are already mounted to said housing; and a fastening subassembly for affixing said lid subassembly to said housing and for securing the latter to a firm member of a in-floor or alike structure; said housing, having a shape of a hollow, single piece cylinder, being provided with a top and a bottom and starts from said top with an internal, relatively shallow cylindrical cavity and continues downwardly towards said bottom with an internal, relatively deep cylindrical cavity, the interior diameter of the former being lesser than the interior diameter of the latter; said housing having also several closed, threaded holes, equidistantly spaced on a circumference coaxial with and between the external circumference of said housing and the circumference of said internal, relatively shallow cylindrical cavity, and disposed between the former and the latter, said several closed, threaded holes extending from said top inwardly into a wall situated between a surface defined by the external circumference of said housing and a surface of said internal, relatively deep cylindrical cavity; said housing also incorporating a first annular shallow channel starting from said top and disposed between the circumference corresponding to said several threaded holes and the circumference corresponding to said internal, relatively shallow cylindrical cavity, said first annular shallow channel being coaxial with the foregoing circumferences; and a second annular shallow channel extending radially, proximately to said top, into a wall of said internal, relatively shallow cylindrical cavity; said cylindrical external surface of said housing being interrupted, adjacent to said bottom, by a flat, relatively small zone, while an identical, threaded aperture being formed, centrally, in each mentioned items, namely said bottom and said flat, relatively small zone, one of said identical, threaded apertures being usually closed by a sealing, threaded plug; and a pair of closed, threaded openings situated approximately midway between said top and said bottom and located diametrically, extends radially from said cylindrical external surface of said housing into the wall of the latter; said sealing subassembly including a first and second O-rings, said first O-ring being partially inserted into said first annular shallow channel and partially protruding outside the latter, said second O-ring being partially inserted into said second annular shallow channel and partially protruding outside the latter, said electrical light subassembly, located within said housing, including a lamp socket to which is plugged, a lamp, usually of low voltage, located in a focus of a reflector having a base end and a upper end, the latter extending outwardly and horizontally into a peripheral, substantially flat flange; said reflector being internally received in said housing and seated with said peripheral, substantially flat flange and partially with its upper end of said reflector on a shoulder located within said first annular shallow channel and formed by a protruding part of said second O-ring and, thus, said reflector engages and is retained against the latter; in a position corresponding to said recessed light fixture not completely assembled, said peripheral flat flange protruding somewhat above said top of said housing; means for reacting to excess of temperature; the light emitting source of said recessed light being controlled by said means for reacting to excess of temperature that detects, when a temperature of said recessed light fixture exceeds a temperature permissible by regulatory codes, and turns off the light; a water-tight fitting tightened into one of said two threaded apertures, the other one being closed by said sealing, threaded plug; electrical wiring adapted to enter/exit throughout said water-tight fitting and use connectors for interconnecting said lamp socket and said means for reacting to excess of temperature; and potting material for attaching, after their insulation, said means for reacting to excess of temperature to the interior of said housing; said lid subassembly incorporating first lid means for contacting with said top of said housing; and second lid means for superposing on said first lid means, both said first and second lid means being provided, for allowing light to pass therethrough, with a lens, and, for attaching to said housing, with several bores coinciding with said several closed, threaded holes that extent into said housing; each of said several bores, drilled into said first lid means for contacting with said top of said housing, being provided with a lower threaded part and an upper cylindrical part, said lower threaded part having a diameter larger than the diameter of said closed, threaded holes, while said upper cylindrical part has a diameter larger than said lower threaded part; a plurality of slots disposed in said second lid means for superposing on said first lid means, communicate with an internal space wherein heated air is generated between said first lid means for contacting with said top of said housing and said second lid means for superposing on said first lid means; and fastening means for affixing said lid subassembly to said housing and for securing the latter to a firm member of an in-floor or alike structure.