Minimum requirement of illumination level on construction site project activities is 50 lux. This illumination level is still acceptable for common site work as steel bar works, earth works, concrete works. Measurement of illumination level shall use lux-meter.
When the illumination on site is below 50 lux, those kinds of work must be stopped immediately. Working in poor illuminated area is considered high risk.
Supervisors is required to submit work permit for night shift work to make sure that illumination requirement has been met. Without work permit for night shift, no work shall be commenced on site at night time.