[Ord. 803, 10/7/2002, § 115]
1. 
For the purposes of this Part, certain terms and words used herein shall be interpreted as follows:
A. 
The word "shall" denotes a mandatory requirement; the word "should" denotes an advised or recommended provision that is desirable but not mandatory.
B. 
The word "includes" or "including" shall not limit the term to the specific example, but is intended to extend its meaning to all other instances of like kind and character.
C. 
Words used in the present tense include the future; words used in the masculine gender include the feminine and neuter; the singular number includes the plural and the plural the singular.
[Ord. 803, 10/7/2002, § 116]
The meaning and applicability of words and terms in this Part which are related to zoning, zoning districts, lots, lot usage, yards, and the like, shall be in accordance with the Ferguson Township Zoning Ordinance [Chapter 27].
[Ord. 803, 10/7/2002, § 117]
The following lighting definitions are selected from the ANSI/IES Lighting Definitions and the IES Lighting Handbook for ready reference within the text of this Part:
CANDELA
The SI unit of luminous intensity. One candela is one lumen per steradian (lm/sr).
CANDLEPOWER
Luminous intensity expressed in candelas.
CUTOFF ANGLE (OF A LUMINAIRE)
The angle, measured up from nadir, between the vertical axis and the first line of sight at which the bare source is not visible.
FOOTCANDLE
A unit of illuminance. One footcandle is one lumen per square foot (lm/ft2).
GLARE
The sensation produced by luminances within the visual field that is sufficiently greater than the luminance to which the eyes are adapted to cause annoyance, discomfort, or loss in visual performance or visibility.
BLINDING GLARE – Glare that is so intense that for an appreciable length of time after it has been removed, no object can be seen.
DIRECT GLARE – Glare resulting from high luminances or insufficiently shielded light sources in the field of view.
DISABILITY GLARE – The effect of stray light in the eye whereby visibility and visual performance are reduced.
DISCOMFORT GLARE – Glare that produces discomfort. It does not necessarily interfere with visual performance or visibility.
REFLECTED GLARE – Glare resulting from reflections of high luminances in polished or glossy surfaces in the field of view.
ILLUMINANCE
The areal density of the luminous flux incident at a point on a surface.
ILLUMINATION
An alternative term for illuminance. Commonly used in a qualitative or general sense to designate the act of illuminating or the state of being illuminated.
LAMP
A generic term for a man-made source of light.
LIGHT
Radiant energy that is capable of exciting the retina and producing a visual sensation. The visible portion of the electromagnetic spectrum extends from about 380 to 770 nanometers.
LIGHT LOSS FACTOR (LLF)
The ratio of illuminance for a given area to the value that would occur if lamps operated at their initial rated lumen output and if no system variation or deprecation had occurred.
LIGHT TRESPASS
A subjective perception of undesirable illumination including the following examples:
(1) 
The classic "light shining in a window."
(2) 
Unwanted light on an adjacent property.
(3) 
Excessive brightness in the normal field of vision (nuisance glare).
LUMEN
SI unit of luminous flux. Photometrically, it is the luminous flux emitted within a unit solid angle (one steradian) by a point source having a uniform luminous intensity of one candela.
LUMINAIRE
A complete lighting unit consisting of one or more lamps (light sources) together with the parts designed to control the light distribution, and other mechanical and electrical components.
CUTOFF LUMINAIRE
A luminaire light distribution is designated as cutoff when the candlepower per 1,000 lamp lumens does not numerically exceed 25 (2.5%) at an angle of 90° above nadir (horizontal), and 100 (10%) at a vertical angle of 80° above nadir.
LUMINANCE
The emitted or reflected light from a surface; relates directly to perceived "brightness." The unit of luminance is the candela per square meter (cd/m2).
LUMINOUS FLUX
Radiant flux (radiant power); the time rate of flow of radiant energy evaluated in terms of a standardized visual response.
LUMINOUS INTENSITY
The luminous flux per unit solid angle in the direction in question. May be expressed in candelas or lumens per steradian (lm/sr).
LUX
The S1 unit of illuminance. One lux is one lumen per square meter (lm/m2).
NIGHTTIME
The hours between the end of evening civil twilight and the beginning of morning civil twilight. Civil twilight ends in the evening when the center of the sun's disk is 6° below the horizon, and begins in the morning when the center of the sun's disk is 6° below the horizon.
SPILL LIGHT
Light shining beyond a facility that may annoy occupants of the adjacent property.