Light levels on ships Targets Measuring position Light level (Lux) X SD Day Night Fishery ships (n=30) Deck Natural Light 2866, 9 78, 5 Navigation bridge 280, 03 32, 39 1666, 02 127, 7 Ocean ships (n=30) Navigation bridge 370, 16 18, 51 Deck Natural light Engine Room 312, 46 15, 17 Crew Cabin 312, 10 11, 46 Sanitation and Hygiene Standards (3733 / 2002 / QĐ - BYT) 300 - 500 lux Table 3.15 shows us that Light on fishing board and shipping vessels in daytime are within the limits of the Sanitation and Hygiene Standards.