law: Factories Act, 1948 
  17. Lighting 
  (1) In every part of a factory where workers are working or
  
  passing there shall be provided and maintained sufficient and suitable
  
  lighting, natural or artificial, or both.
  (2) In every factory all glazed windows and skylights used for
  
  the lighting of the workroom shall be kept clean on both the inner and outer
  
  surfaces and so far as compliance with the provisions of any rules made under
  
  sub-section (3) of section 13 will allow, free from obstruction.
  (3) In every factory effective provision shall, so far as is
  
  practicable, be made for the prevention of- 
  (a) glare, either directly from a source of
  
  light or by reflection from a smooth or polished surface;
  (b) the formation of shadows to such an extent
  
  as to cause eye-strain or the risk of accident to any worker.
  (4) The State Government may prescribe standards of sufficient
  
  and suitable lighting for factories or for any class or description of
  
  factories or for any manufacturing process.