Kitchener By-law 680, s. 680.3.31(a) — Signs

the illuminance of any automatic changing copy shall be measured with an illuminance meter set to measure footcandles accurate to at least two decimals. Illuminance shall be measured with the automatic changing copy off, and again with the automatic changing copy displaying a white image for a full colour capable automatic changing copy, or a solid message for a single-colour automatic changing copy. All measurements shall be taken perpendicular to the face of the automatic changing copy at the distance determined by the total square footage of the automatic changing copy as set for in the accompanying Sign Area Versus Measurement Distance Formula in Section 680.3.31 (d);

• (b) the difference between the off and solid-message measurements using automatic changing copy measurement criteria noted above shall not exceed 0.3 footcandles;
• (c) all permitted illuminated automatic changing copy shall be equipped with a sensor or other device that automatically determines the ambient illumination and programmed to automatically dim according to ambient light conditions, or that can be adjusted to comply with the 0.3 footcandle measurements; and
• (d) the measurement distance is to be calculated with the following formula: Measurement Distance in Metres = sq rt Area of Sign Sq.M. x 100.