Authority: IC 16-41-35-26; IC 16-41-35-29

Affected: IC 16-41-35

Sec. 30. As used in this rule, "contrast ratio" means the illumination inside the area three (3) mm from the edge of the light field (I1), divided by the illumination outside the area three (3) mm from the edge of the light field (I2). It is calculated using the following equation: Contrast ratio = I₁/I₂

(Indiana Department of Health; 410 IAC 5-6.1-30; filed Oct 29, 1993, 5:00 p.m.: 17 IR 359; readopted filed Jul 11, 2001, 2:23 p.m.: 24 IR 4234; readopted filed May 22, 2007, 1:44 p.m.: 20070613-IR-410070141RFA; readopted filed Sep 11, 2013, 3:19 p.m.: 20131009-IR-410130346RFA; readopted filed Nov 13, 2019, 3:14 p.m.: 20191211-IR-410190391RFA; readopted filed Nov 14, 2025, 11:18 a.m.: 20251210-IR-410240588RFA)