East Anglia ONE Offshore Windfarm Construction Artificial Lighting Emissions Plan
September, 2016
5.3 Types and Positioning Requirements 55.
Lighting should be sufficient to enable people to work, use facilities and move from place to place safely and without experiencing eye-strain. Table 5-2 below, which has been adapted from Health and Safety and Executive (HSE) document Health and Safety Guidance 38 (HSG38) ‘Lighting atWork’, details the recommended minimum lighting levels for different types of work activity and location applicable to the outside working areas. It makes recommendations for average illuminance for the work area as a whole and for minimum measured illuminance at any position within it.
Table 5-2 Recommendations for Minimum Lighting Levels (adapted from HSE document HSG38 (Lighting atWork). Activity
Typical locations/ types of work Average illuminance
measured (lux) 1x
Movement of people, machines and vehicles(a)
Background work including movement of people, machines and vehicles in hazardous areas; rough work not requiring perception of detail
Task based lighting and work requiring limited perception of detail
Access roads and vehicle compound/parking areas.
Construction site clearance, excavation and soil work.
Where specific work tasks are required along the cable route focusing on a particular point in a trench or at a feature.
56. 20 50
Minimum illuminance
measured (lux) 1x
5 20
100
50
The artificial lighting required at HDD locations, CCS sites and at the onshore substation (only for key construction activities) will comply with the minimum requirements for safe work operations, the guidance and standards (Section 2) and mitigation measures avoiding or minimising the impacts on sensitive visual and ecological receptors.
57.
Where HDD is used to cross the Deben Estuary and Martlesham Creek mitigation measures will be implemented with appropriate monitoring, to ensure that artificial illumination of areas used by concentrations of Brent Goose and Avocet is kept below 1 lux.
58. Light types will be selected taking into account the Bat Conservation Trust (2014) guidelines:
Use narrow spectrum light sources to lower the range of species affected by lighting. Use light sources that emit minimal ultra-violet light. Lights should peak higher than 550nm. Avoid white and blue wavelengths of the light spectrum to reduce insect attraction and where white light sources are required in order to manage the blue short wave length content they should be of a warm / neutral colour temperature <4,200 kelvin.
59.
Directional beams and non-reflective surfaces will be used to ensure light spill and nuisance does not encroach onto adjacent areas. The light columns will be up to 5m high with directional flow towards specific work areas.
5.4 Hours of lighting 60.
The need for artificial lighting will be dependent on seasonality and will be switched on 30 minutes before sunset (which will change through the winter) to the end of the shift. It will also be switched on at the start of the shift to up to 30 minutes after sunrise. Again dependant on seasonality and will change through the winter months and with daylight savings adjustments. Temporary construction lighting will be also provided along the cable route during working hours only at times where natural light is not sufficient to carry out specific works to ensure safe working conditions.
61. Working hours will comply with DCO Requirement 23, which states:
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