The bridge is located in the city's E1 area, which has been designated the maximum rating as a protected area. It was therefore essential to install lighting that affected the environment, animal species and the fauna as little as possible in order to preserve their biological diversity and special status, as well as the quality of the night sky for astronomical observation.
The luminaires with LED technology have a peak emission of 440 nm, which is the main factor that affects fauna. The amber lighting from these LEDs cancels out this peak emission, and as a result has a zero impact on the environment and wildlife. The fauna and insects in particular are adapted to a nocturnal life. At night, they are able to hide from their predators, eat, hunt and reproduce. Most fauna is sensitive to ultraviolet radiation, but in contrast amber tones are almost invisible to wildlife and do not perturb animal life cycles. By using the PC-Amber LEDs, they do not feel threatened by the lighting or approach the source of light emission, thus ensuring that the reproductive cycle of insects is not affected.
Ignialight has designed a new luminary for installation on the bridge over the river Ter. This luminary, which has been called TER, is one metre long and made of extruded 6063 anodised aluminium. This ensures that the LED's colour temperature is properly dispersed, whilst the quality of this material means that the LEDs are able to withstand the extreme weather conditions to which exterior lighting is subject for a long time.
These luminaires attain an average level of lighting above 15 lux, which is in compliance with regulations on street lighting, namely, 16 lux on pavements and 22 lux on roads. This directional and totally standardised lighting is an efficient way of illuminating the 486-metre wide and 20-metre wide bridge.