Definitions. As used in this subsection, the following terms shall have the meanings indicated:
A light fixture that restricts the amount of light emission by shielding parts of the lamp. A cutoff or semicutoff design allows a restricted amount of light emitted above the horizontal plane running through the lowest point on the luminaire.
The assembly that holds the lamp in a lighting system. It includes the elements designed to give light output control, such as a reflector or refractor, the ballast, housing and the attached parts.
The basic measuring unit of illuminance. Footcandle measurement is taken with a light meter with CIE photopic (human eye response curve). One footcandle is approximately equal to the illuminance produced by a light source of one candela in intensity, measured on a surface at a one foot distance from the source. Horizontal and vertical footcandle measure the illumination striking a horizontal plane or vertical plane, respectively.
A light fixture that cuts off all upward transmission of light above an angle of 90º from the horizontal plane at the lowest part of the luminaire.
A luminaire constructed and installed such that all light emitted, either directly from the lamp or a diffusing element, or indirectly by reflection or refraction from any part of the luminaire, is projected below the horizontal. It is the same as a full-cutoff luminaire, but without any restrictions on light distribution below the horizontal plane.
Discomfort experienced by an observer with a direct line-of-sight to a light source which often results in visual impairment due to an intensity great enough to reduce the viewer's ability to see.
Light projected onto a property from a fixture not on that property.
A measure of the brightness of the illumination exiting a bulb, provided by a manufacturer. One footcandle is one lumen per square foot.
A complete lighting fixture, including the lamp, housing, ballasts, and photocells, less the support and mounting assembly.
Specific illumination of an outdoor area or object by any man-made device located outdoors that produces light by any means for a period of less than seven days, with at least 180 days passing before being used again.