The officers and staff working on the bridge are exposed to natural daylight during the day but are also in need of night vision light fittings when the vessels are operating. When the ships are docked in a harbour, daylight lux levels are required. This means a high demand of special features are required for light fittings installed in the bridge.
Different areas on the ship have special demands on lighting
Just like all areas on board a Navy or Marine vessel, the bridge has its own particular demands on the installed equipment. Limited space demands lighting solutions that are compact with low design heights.
Important factors when working with lighting solutions for control rooms:
- Light quality and daylight-night modes.
- Dimming capability.
- Emergency systems (in case of power failure/black outs).
- No maintenance and reduced power consumption (high energy efficiency).
- EMC disturbance/interference.
- Mechanical design/impact resistance.
On the bridge, light fittings are needed that simulate both daylight and night modes. The light output quality is important here due to visual perception to enable the crew to distinguish between different colours and details. The colour-rendering index (CRI) should be above 80, the lux-level around 150 lux in order to enable people to differentiate between colours and to view true colours. To avoid shadowing and to reduce glare (UGR, unified glare ratio) a proper light calculation should be carried out and luminaires with homogeneous light distribution should be selected. The colour temperature preferred on a bridge should be equal to or higher than 3000 Kelvin in order to improve safety during daylight levels. In addition, a Red or green or blue light mode is needed during night-time operations to ensure night vision capabilities. The dual capabilities of lighting systems on the bridge ensure maximum energy efficiency and good, safe working conditions for all staff.
On a bridge, lighting with adjustable dimming is often required, depending on the staff’s needs for night vision capabilities.
Centralised (one battery bank /generator for all lighting) and decentralised (built in battery) lighting systems are required for the bridge. UPS (uninterruptible power supply) systems may also be required for critical lighting, emergency lighting and exit signs.
No maintenance and reduced power consumption
Easy installation and various mounting options ensures flexibility, time savings and improved safety for crew members, primarily because some lights may be located in areas that are difficult to reach or access. The luminaires should consume as little energy as possible in order to reduce the size of power generators, to save energy and to reduce pollution/emissions. The efficiency and operating life of LEDs continues to improve, and LED luminaires are virtually maintenance-free. This means that vessels with LED lighting will have lower operating costs compared to vessels with conventional luminaires. The initial investment in an LED installation may well be higher than that of a traditional lighting installation, but the LED’s lower energy consumption and maintenance costs means that this price difference is quickly recouped and payback on the initial investment is recovered quickly.
EMC is becoming increasingly important in all industries and applications. The increased use of electronic components in modern ship designs, particularly in the control room, requires more stringent control of the EMC requirements. EMC 1 protection, both conducted and radiated, must be guaranteed on all light fittings installed in the bridge. This is covered by the international standard IEC61000-3-2:2006:A1. or other military standard.
Using the correct combination of materials in the luminaire is important, to ensure robustness and a long operating life. The use of aluminium is critical for LED lighting products to ensure sufficient cooling for continuous operation, low maintenance and increased operating life. Lighting that is easy to install and that offers various mounting options, ensures flexibility and time savings. Low build heights and a compact design of the luminaires will enable mounting even in areas where space may be limited.
We always recommend the use of a Navy or Marine-approved lighting product in a bridge.