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To reduce energy consumption all lighting except in the engine room should be DC, fitted with dimmer switches where appropriate. The engine room can have dual DC and AC lighting. The latter will make it easier to work in the engine room when connected to shore power, especially if the DC system must be disconnected. The long tube length of fluorescents will give more even illumination than other types of lighting. However, the DC lighting should give sufficient illumination for work at sea.
The ideal daylight lamp for ambient lighting will have a colour temperature of 2700 Kelvin (K) at a wavelength of 555 nanometres (nm), a Colour Rendering Index (CRI) greater than 84, and produce 100 lumens per input watt.
In the pilothouse, use blue-green (507 nm) or turquoise (495 nm) LEDs for night vision. Use dim white for reading colours on maps.