Adequate illumination is crucial for safety on construction sites 3, 10. Here's what you need to know:

• General Illumination: Construction areas, aisles, stairs, ramps, corridors, offices, shops, and storage areas must be adequately lighted with natural or artificial illumination when work is in progress [1].
• Minimum Illumination: Areas accessible to employees must be lighted to not less than the minimum illumination intensities [2].
• Night Work & Poor Visibility: When working at night or in conditions of poor visibility, power lines must be illuminated or another means of identifying the location of the lines must be used [3]. A safe path of travel must be identified and used [3].
• Mobile Equipment: Powered mobile equipment operated during hours of darkness or when visibility is poor must be equipped with lights that illuminate the direction of travel, the working area, and the control panel [4].
• Emergency Lighting: Emergency lighting must be available at a work site if workers are in danger if the normal lighting system fails [5]. This lighting should allow workers to leave the site safely, start emergency shutdown procedures and restore normal lighting [5].
• Urban Areas: When operating in dark locations, turn on the work light. If necessary, use additional lighting devices to make the work areas bright enough to operate 7, 8, 9, 15.
• Portable Luminaries: Ensure electrical cords and fittings are approved for the intended use and properly maintained [6].
• Luminaire Safety: Ensure that a luminaire that is located at a height of less than 2.1 meters above a working or walking surface is protected against physical or mechanical damage by installation of a safeguard or the location of the luminaire [6].

It's also important to stop work if you have poor or limited visibility due to darkness, fog, rain, or snow 7, 8, 9, 15, 17.