Shielding requirements – Shielded lighting directs light downward into a cone that avoids
contributing to glare, light trespass, and sky glow. At present, most street lighting in Saskatchewan
is unshielded or only partially shielded, and unshielded fixtures such as acorn lights continue to be
installed. All the legislation and bylaws examined by the Commission favour light fixtures with
“full cut off,” defined in the Indiana Framework as “a light fixture which cuts off all upward
transmission of light.” All legislation and bylaws contain similar practical criteria. For example, the
Indiana Framework provides:
DIRECTIONAL CONTROL
All luminaires of 1800 or more lumens shall be full cutoff as installed. For luminaires
under 1800 the bulb must be frosted glass or installed behind a translucent cover,
except floodlights which must be aimed no higher than 45 degrees below horizontal.
This can be accomplished by the use of full-cutoff (fco) fixture design, shielding