Mich. Admin. Code R. 408.10686 - Sign illumination and letter size
Rule 686.
(1)
An exit sign shall be illuminated to a surface value of at least 5 foot-candles
(54 lux) by a reliable light source and be distinctive in color. Self-luminous
or electroluminescent signs that have a minimum luminance surface value of at
least .06 foot lamberts (0.21 cd/m2) are
permitted.
(2) An exit sign shall
have the word "EXIT" in plainly legible letters not less than 6 inches (15.2
cm) high, with the principal strokes of the letters in the word "EXIT" not less
than 3/4 of an inch (1.9 cm) wide.
(3) An internally illuminated exit sign shall
be provided where the reduction of normal illumination is permitted and less
than 5 footcandles would appear on the exit sign.
Notes
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