C-18.1, r. 3 - Technical Standards Regulation

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2. The brightness at the centre of the screen of an outdoor theatre must be at least 24 cd/m2 (7 La. ft) when the brightness measurements are taken from a place located on a longitudinal line, at the centre of the parking area for motor vehicles, at an equal distance from the first and last rows of motor vehicles.
In no case, where measurement is taken from a motor vehicle situated in an outdoor theatre parking area, may the brightness at the centre of the screen be less than 15 cd/m2 (4.5 La. ft).
O.C. 1900-87, s. 2.