Indirect lighting fixture
AssigneeLitecontrol Corporation
InventorJohn M. Cole, Jr.
Life of this patent
Estimating the term…
Abstract
An indirect fluorescent luminaire with planar specular reflectors arranged in such a manner as to project its maximum intensity approximately at 130.degree. above nadir to optimize the uniformity of ceiling luminance. The lamps are stacked vertically to further minimize the vertical projection of intensity and enhance the lateral projection. The fixture may be suspended at distances of 12 inches or less from the ceiling without causing excessive luminance on the ceiling above the luminaire or excessive luminance ratios between the brightest area directly over the fixture and a point midway between them.
Claims11
An indirect fluorescent multiple tube light fixture for mounting a distance below a ceiling surface comprising an elongated rectangular housing having a flat bottom wall, linear fluorescent tubes mounted one above the other to define a lower tube and an upper tube, and elongated side reflectors arranged parallel to the tubes,
- an upper reflecting surface portion of each of said side reflectors being positioned above and at an angle closer to the vertical than a lower elongated reflecting surface portion of the side reflector,
- the upper and lower reflecting surface portions each being arranged to reflect light energy from the lower tube at a respective angle such that the reflected light energy will pass above the upper tube at a low angle to the horizontal, and
- the lower reflecting surface portion being below said upper tube and being arranged to reflect light energy from the upper tube at an angle such that the reflected light energy will pass above the upper tube at a low angle to the horizontal.
An indirect fluorescent multiple tube light fixture for mounting a distance below a ceiling surface comprising an elongated rectangular housing having a flat bottom wall, linear fluorescent tubes mounted one above the other to define a lower tube and an upper tube, and elongated side reflectors arranged parallel to the tubes, an upper reflecting surface portion of each of said side reflectors being positioned above and at an angle closer to the vertical than a lower elongated reflecting surface portion of the side reflector, and the upper and lower reflecting surface portions each being arranged to reflect light energy from the lower tube at a respective angle such that the reflected light energy will pass above the upper tube at a low angle to the horizontal, said lower reflecting surface portion being arranged such that light of the incident ray from said upper tube reflected by said lower reflecting surface portion does not intercept either said upper tube or said lower tube.
An indirect fluorescent light fixture for mounting a distance below a ceiling surface comprising:
- an elongated housing having a flat bottom wall;
- two linear fluorescent tubes mounted one above the other to define a lower tube and an upper tube;
- and,
- elongated side reflectors arranged parallel to and on opposite sides of said tubes, each of said side reflectors including a lower elongated reflecting surface portion and an upper elongated reflecting surface portion positioned above and at an angle closer to the vertical than the lower side portion,
- said tubes and said reflectors being arranged such that
- light energy from the incident rays from lower tube reflected from said upper and lower reflecting surface portions will pass above the upper tube at a low angle to the horizontal,
- light energy from the incident ray of upper tube reflected from said upper and lower reflecting surface portions will pass above the upper tube at a lower angle to the horizontal then does light energy from the lower tube reflected by the respective reflecting portion, and
- light energy from the incident ray from the upper tube reflected by the lower reflecting surface portion does not intercept either the upper tube or the lower tube.
An indirect fluorescent multiple tube light fixture for mounting a distance below a ceiling surface comprising an elongated rectangular housing having a flat bottom wall, linear fluorescent tubes mounted one above the other to define a lower tube and an upper tube, and elongated side reflectors arranged parallel to the tubes,
- an upper reflecting surface portion of each of said side reflectors being positioned above and at an angle closer to the vertical than a lower elongated reflecting surface portion of the side reflector,
- the lower reflecting surface portion being positioned below the upper tube and being arranged to reflect light energy from the upper tube at an angle such that the reflected light energy will pass above the upper tube at a low angle to the horizontal and such that light of the incident ray from said upper tube reflected by said lower reflecting surface portion does not intercept either said upper tube or said lower tube.
Dependencies are inferred from the claim text.