N.H. Rev. Stat. § 9-E:1

In this chapter: I. "Fixture" means the assembly that holds a lamp and may include an assembly housing, a mounting bracket or pole socket, a lamp holder, a ballast, a reflector or mirror, and a refractor or lens. II. "Fully shielded luminaire" means a luminaire that allows no direct light emissions above a horizontal plane through the luminaire's lowest light-emitting part. III. "Glare" means direct light emitting from a luminaire that is significantly greater than luminance to which the eyes are adapted which causes reduced vision or momentary blindness. IV. "Illuminance" means the unit measure of light at a surface. V. "Light trespass" means light emitted by a luminaire that shines beyond the boundaries of the property on which the luminaire is located. VI. "Lumen" means a unit of measure of luminous flux. VII. "Luminaire" means the complete lighting system, including the lamp and the fixture. VIII. "Lamp" means the component of a luminaire that produces the specific form of radiant energy that is observed as light. IX. "Permanent outdoor luminaire" means any luminaire or system of luminaires that is outdoors and intended to be used for 21 days or longer. X. "State highway" means any of the highways of the state classified in RSA 229:5.