This paper comprehensively details out the findings of illumination survey conducted at a mechanized opcocast coal mine of a public sector company vis-à-vis the illuminance standards prescribed by the Directorate General of Mines Safety (DGMS) at: haul road, dump yard, coal face. OB face, substation and various HEMMs. It also includes modification of llumination systems at different locations using software where illumination levels were found unsatisfactory using software.