Signs may be internally or externally illuminated but shall not exceed a brightness level of 0.3 foot candles above ambient light as measured using a foot candle (Lux) meter at a preset distance depending on sign area, measured as in the table below.
Sign Illumination Measurement | |
Area of Illuminated Surface (Sq. Ft.) | Measurement Distance (Ft.) |
Sign Illumination Measurement | |
Area of Illuminated Surface (Sq. Ft.) | Measurement Distance (Ft.) |
10 | 32 |
15 | 39 |
20 | 45 |
25 | 50 |
30 | 55 |
35 | 59 |
40 | 63 |
45 | 67 |
50 | 71 |
55 | 74 |
60 | 77 |
65 | 81 |
70 | 84 |
75 | 87 |
80 | 89 |
85 | 92 |
90 | 95 |
95 | 97 |
100 | 100 |
105 | 103 |
110 | 105 |
115 | 107 |
120 | 110 |
125 | 112 |
130 | 114 |
135 | 116 |
* For signs with an area other than those specifically listed in the table (i.e., 12 sq ft.), the measurement distance will be whichever listed standard is closest, (i.e., 12 sq ft utilizes the 10 sq ft standard. 13 sq ft utilizes the 15 sq ft standard) * Any sign larger than provided for in table shall measure distance by the following calculation: The square root of the product of the sign area and one-hundred. | |
Measurement Distance = √ (square foot * 100)
Example using a 225 square foot sign
Measurement Distance = √ (225 * 100) = 150 feet
(Ord. 4926, passed 8-15-2017)