Light distribution for narrow corridors and aisles

A method of illuminating a corridor, the method comprising:

• mounting, at a first height above a floor surface, at least a first lighting apparatus that has one or more light sources that lie along a horizontal plane and that define a first optical axis that is normal to the horizontal plane and that extends toward the floor surface of the corridor that is parallel to the horizontal plane,
• wherein, the first optical axis further defines an intersection between a first vertical plane that is orthogonal to the horizontal plane and extends across the corridor and a second vertical plane that is orthogonal to both the first vertical plane and the horizontal plane and extends along the corridor;
• configuring the first lighting apparatus to provide a total distribution of light that has a luminous intensity that is centered upon, and asymmetrical about, the first optical axis,
• wherein the total distribution of light:
• (i) considered in cross-section with respect to the first vertical plane has a first cross-section luminous intensity distribution with a first width, wherein the first full width at 50% maximum luminous intensity of the first cross-section luminous intensity distribution spans less than 40 degrees and wherein the first full width at 10% maximum luminous intensity of the first cross-section luminous intensity distribution spans less than 67 degrees;
• (ii) considered in cross-section with respect to the second vertical plane has a second cross-section luminous intensity distribution with a second width that exceeds the first width,
• wherein the second full width at 50% maximum luminous intensity of the second cross-section luminous intensity distribution is between 63 and 120 degrees and the second full width at 10% maximum luminous intensity of the second cross-section luminous intensity distribution is between 141 and 170 degrees.

A lighting apparatus comprising:

• (a) at least one light emitter mounted on a first planar surface that defines a horizontal plane, wherein the at least one light emitter defines an origin of a first optical axis that is normal to the horizontal plane,
• wherein the first optical axis defines an intersection between a first vertical plane that is orthogonal to the horizontal plane and a second vertical plane that is orthogonal to both the first vertical plane and the horizontal plane,
• wherein an offset plane is defined that is orthogonal to the horizontal plane and coincident to the first optical axis and is skewed from the first vertical plane by an angle ρ between 60 and 88 degrees;
• and
• (b) at least one optic that is configured to direct light from the at least one light emitter to form a total optical distribution of luminous intensity that is centered upon, and asymmetrical about, the first optical axis,
• wherein the total optical distribution:
• (i) considered in cross-section with respect to the first vertical plane, is symmetric, and has a first cross-section luminous intensity distribution with a first width and a first maximum luminous intensity,
• (ii) considered in cross-section with respect to the second vertical plane has second cross-section luminous intensity distribution with a second width and a second maximum luminous intensity, wherein the second cross-section luminous intensity distribution exceeds the first width by at least 2× at full width at 10% total maximum luminous intensity, and that exceeds the first width by more than 3× at full width at 50% total maximum luminous intensity;
• (iii) considered in cross-section with respect to the offset plane has an offset cross-section luminous intensity distribution with an offset width that exceeds the second width.