Luminaire comprising means for reducing temperature of exterior refractor

Claim 2

A luminaire comprising a housing, a high intensity light source mounted within said housing, first refractor means for closing the bottom opening of said housing, means for reducing the temperature at said refractor means mounted between said light source and said first refractor and comprising means for intercepting direct light from said light source that would otherwise strike said first refractor, said temperature reducing means including means for diffusing said intercepted light, said first refractor including cut-off means for internally reflecting light which would otherwise be emitted at relatively high angles, the interior surface of said housing comprising means for diffusing light from said light source and for directing a portion thereof to said bottom opening, said temperature reducing and light diffusing means being spaced from said first refractor so that a substantial portion of the light from said light source which is diffused by said housing and directed therefrom to pass out of said bottom opening will not be intercepted by said temperature reducing and light and wherein said temperature reducing and light diffusion means further comprises means for redistributing a portion of the infrared heat energy of said intercepted light, and wherein substantially all of said temperature reducing and light diffusing means and the periphery thereof is spaced from said first refractor so that air will be freely circulatable between said first refractor and said temperature reducing and light diffusing means.

Claim 3

A luminaire comprising a high intensity light source, a first light controlling member spaced from said light source, a second light controlling means positioned intermediate the source and first light controlling member for reducing the temperature at said first light controlling member and comprising means for intercepting substantially all direct light from the source which would otherwise be incident on said first member and for diffusing such light upon the incident surface of said first member, a housing completely enclosing the source and said light controlling means and having a substantially wholly diffusely reflective internal surface, the internal surface of said housing constituting means for receiving direct light from the light source and diffusely reflecting the same to said first member, said housing having an opening, said first member extending across and filling that opening and comprising means for receiving diffused light from said light controlling means and for receiving diffused light from said housing internal surface and for redirecting the same onto relatively large areas said light controlling means being fabricated of glass and being spaced from said light source and said first member and the periphery of said light controlling means being spaced from said housing so as further to constitute means for redistributing heat energy of the light incident thereon and for permitting circulation of air thereabout.

Claim 4

A luminaire comprising a high intensity light source, a first light controlling member spaced from said light source, a second light controlling means positioned intermediate the source and first light controlling member for reducing the temperature at said first light controlling member and comprising means for intercepting substantially all direct light from the source which would otherwise be incident on said first member and for diffusing such light upon the incident surface of said first member, a housing completely enclosing the source and said light controlling means and having a substantially wholly diffusely reflective internal surface, the internal surface of said housing constituting means for receiving direct light from the light source and diffusely reflecting the same to said first member, said housing having an opening, said first member extending across and filling that opening and comprising means for receiving diffused light from said light controlling means and for receiving diffused light from said housing internal surface and for redirecting the same onto relatively large areas said light controlling means being fabricated of glass and being spaced from said light source and said first member and the periphery of said light controlling means being spaced from said housing so as further to constitute means for redistributing heat energy of the light incident thereon and for permitting circulation of air thereabout.

Claim 5

A luminaire as claimed in claim 2 wherein said diffusing means includes concentric prisms.

Claim 6

A luminaire comprising a high intensity light source, a housing Surrounding said source and having an opening, an interior surface of the housing being diffusely reflective whereby that portion of the light from the source incident upon the interior surface is diffusely reflected to said opening, a light diffusing means positioned between said source and opening and spaced from said source and opening and from said housing for reducing the temperature at said light controlling member, said diffusing means being located to intercept substantially all direct light between said source and opening and a light controlling member positioned in said opening to intercept substantially all light passing therethrough and to receive diffused light from said housing and said light diffusing means, said light controlling member having means for internally reflecting light which would otherwise be emitted at relatively high angles through said opening, said diffusing means being heat resistant and of material to absorb and redistribute heat from the light source which otherwise would be directed upon localized areas of said light controlling member, and said light controlling member being of a thermo plastic material and being so located relatively to the light source that it would be adversely effected by the heat from said light source but for the interposition of said diffusing means.

Claim 7

A luminaire comprising a high intensity light source, a housing Surrounding said source and having an opening, an interior surface of the housing being diffusely reflective whereby that portion of the light from the source incident upon the interior surface is diffusely reflected to said opening, a light diffusing means positioned between said source and opening and spaced from said source and opening and from said housing for reducing the temperature at said light controlling member, said diffusing means being located to intercept substantially all direct light between said source and opening and a light controlling member positioned in said opening to intercept substantially all light passing therethrough and to receive diffused light from said housing and said light diffusing means, said light controlling member having means for internally reflecting light which would otherwise be emitted at relatively high angles through said opening, said diffusing means being heat resistant and of material to absorb and redistribute heat from the light source which otherwise would be directed upon localized areas of said light controlling member, and said light controlling member being of a thermo plastic material and being so located relatively to the light source that it would be adversely effected by the heat from said light source but for the interposition of said diffusing means.

Claim 8

A luminaire as claimed in claim 4 wherein said housing is shaped to intercept substantially all light from the source that does not pass directly from the source to said light controlling means.

Claim 9

A luminaire as claimed in claim 4 wherein said diffusing means comprises flutes extending radially from the center thereof.

Claim 10

A luminaire as claimed in claim 4 wherein substantially all of the internal surface of said housing is diffusely reflective.

Claim 11

A luminaire comprising a housing substantially all of the internal surface of which is diffusely reflecting, a high intensity light source mounted within said housing and being enclosed thereby, a bottom opening in said housing, a prismatic light distributing means for closing the bottom opening of the housing, prismatic light diffusing means for reducing the temperature at the light distributing means located between the light source and the light distributing means and comprising a generally circular element having on that surface thereof closest to the light source a plurality of radially disposed flutes and on its opposite side a plurality of annular prisms whereby direct light incident upon said fluted surface is emitted from said other surface in a diffused fashion and infrared heat energy is redistributed, said light diffusing means having its periphery spaced from the internal surface of the housing and being of such size and so located that the light distributing means is substantially evenly and only illuminated by diffused light from said diffusing means and by diffused light reflected from said housing, said prismatic light distributing means having prisms formed therein for directing the diffused light issuing therefrom above a low angular range and into a wide area.

Claim 12

A luminaire comprising a housing substantially all of the internal surface of which is diffusely reflecting, a high intensity light source mounted within said housing and being enclosed thereby, a bottom opening in said housing, a prismatic light distributing means for closing the bottom opening of the housing, prismatic light diffusing means for reducing the temperature at the light distributing means located between the light source and the light distributing means and comprising a generally circular element having on that surface thereof closest to the light source a plurality of radially disposed flutes and on its opposite side a plurality of annular prisms whereby direct light incident upon said fluted surface is emitted from said other surface in a diffused fashion and infrared heat energy is redistributed, said light diffusing means having its periphery spaced from the internal surface of the housing and being of such size and so located that the light distributing means is substantially evenly and only illuminated by diffused light from said diffusing means and by diffused light reflected from said housing, said prismatic light distributing means having prisms formed therein for directing the diffused light issuing therefrom above a low angular range and into a wide area.

Claim 13

A luminaire comprising a high intensity light source, a housing surrounding said source and having an opening, all of the interior of the housing being diffusely reflective whereby that portion of the light from the source incident upon the interior surface of the housing is diffusely reflected to said opening, a light diffusing element positioned between said source and said opening and spaced from said source and opening and from said housing, said element being located to intercept substantially all direct light between said source and opening, and a light controlling member positioned in said opening to intercept substantially all light passing therethrough and to receive diffused light only from said housing and said light diffusing element, said light controlling member having means for internally reflecting light which would otherwise be emitted at relatively high angles from said opening, said diffusing element being heAt resistant and of a material to absorb and redistribute a substantial portion of the heat from the light source which otherwise would be directed upon localized areas of said light controlling member and said light controlling member being of a thermo plastic material and so located relatively to the light source that it would be adversely effected by the heat from said light source but for the interposition of said light diffusing element whereby said light diffusing element is constituted as means for protecting the light controlling member against the adverse affects of the heat from said light source.

Claim 14

A luminaire comprising a high intensity light source, a housing surrounding said source and having an opening, all of the interior of the housing being diffusely reflective whereby that portion of the light from the source incident upon the interior surface of the housing is diffusely reflected to said opening, a light diffusing element positioned between said source and said opening and spaced from said source and opening and from said housing, said element being located to intercept substantially all direct light between said source and opening, and a light controlling member positioned in said opening to intercept substantially all light passing therethrough and to receive diffused light only from said housing and said light diffusing element, said light controlling member having means for internally reflecting light which would otherwise be emitted at relatively high angles from said opening, said diffusing element being heAt resistant and of a material to absorb and redistribute a substantial portion of the heat from the light source which otherwise would be directed upon localized areas of said light controlling member and said light controlling member being of a thermo plastic material and so located relatively to the light source that it would be adversely effected by the heat from said light source but for the interposition of said light diffusing element whereby said light diffusing element is constituted as means for protecting the light controlling member against the adverse affects of the heat from said light source.