(1) "Direct light" - Light emitting generally in a downward direction by a lamp, off a reflector, or through a refractor of a luminaire;

(2) "Full cutoff luminaire" - A luminaire that allows no direct light from the luminaire above a horizontal plane through the luminaire's lowest light emitting part, in its mounted form;

(3) "Glare" - Direct light emitted by a luminaire that causes reduced visibility of objects or momentary blindness;

(4) "Lamp" - The component of a luminaire that produces light;

(5) "Light pollution" - General sky glow caused by the scattering of artificial light in the atmosphere;

(6) "Light trespass" - Light emitted by a luminaire that shines beyond the boundaries of the property on which the luminaire is located;

(7) "Lumen" - A specific standard unit of measurement of luminous flux;

(8) "Luminaire" - A complete lighting unit, including a lamp or lamps together with the parts designed to distribute the light, to position and protect the lamps, and to connect the lamps to the power supply;

(9) "Noncutoff luminaire" - A streetlight luminaire in which either the lamp and surrounding glass lens extends below the horizontal plane of opaque shielding elements of the luminaire, or the lamp is situated on top of a post or on a pivoting support on the side of a building, causing light to be cast as glare outward and upward, beyond its useful range;

(10) "Outdoor light fixtures" - Outdoor artificial illuminating devices, installed or portable, used for flood lighting, roadway and area lighting, general illumination, or advertisement;

(11) "Permanent outdoor luminaire" - Any fixed luminaire or system of luminaires that is outdoors and that is intended to be used for seven (7) days or longer;

(12) "Roadway lighting" - Permanent outdoor luminaires that are specifically intended to illuminate roadways for automotive vehicles.

(13) "Semi-cutoff luminaire" - A luminaire that allows no more than six (6) percent of the light from the lamp to be emitted above a horizontal plane passing through the luminaire's lowest light emitting part; and

(a) The new or replacement luminaire is a full cutoff luminaire when the rated output of the luminaire is greater the eighteen hundred (1800) lumens;

(b) If a lighting recommendation or regulation applies, the minimum illuminance specified by the recommendation or regulation is used;

(c) If no lighting recommendation or regulation applies, the average minimum illuminance adequate for the intended purpose is used, giving full consideration to energy conservation, glare, and minimizing light trespass;

(d) For roadway lighting unassociated with intersections of two (2) or more streets or highways, a determination is made that the purpose of the lighting installation or replacement cannot be achieved by installation of reflectorized roadway markers, lines, warnings or informational signs, or other passive means; and

(e) Adequate consideration has been given to conserving energy and minimizing glare, light pollution, and light trespass.

(2) The following are exempt from the provisions of this section:

(a) Situations where federal laws, rules and regulations take precedence;

(b) Situations where fire, police, rescue or repair personnel need light for temporary emergencies or road repair work;

(c) Situations where there are special requirements, such as sports facilities, or historic decorative considerations, monuments, or flag lighting; provided, however, that all such lighting shall be selected and installed to shield the lamp(s) from direct view to the greatest extent possible, and to minimize upward lighting and light trespass;

(d) Situations in an urban area where there is high night-time pedestrian traffic and an engineer experienced in outdoor lighting has deemed it necessary to permit the installation of semi-cutoff luminaires; or

(e) Situations where a determination has been made, established through a public hearing process, that there is a compelling safety interest that cannot be addressed by any other method.

The department of transportation shall establish guidelines to implement the provisions of this chapter, including a system to ensure that the use of state funds for street lighting complies with the requirements set forth herein.