At this point, the city developed a collaboration with the local lighting cluster CICAT (Cluster Iluminación de Cataluña) and a luminaire manufacturer, Ignialight, who is one of their members.
It is well known that insects and many forms of wildlife are sensitive to Cool light sources which contain short wavelength (blue) light. This is especially true of LEDs which typically have a peak around 450nm.
The solution was to develop an LED luminaire which does not emit any light below 500nm. IgniaLight specially developed a recessed linear luminaire, made of extruded aluminium and polycarbonate, which has a CCT of 1800K and is amber in appearance.
This is similar in colour to high pressure sodium but it is much more controllable and the colour rendering of CRI 40 is much better than HPS of 25. Furthermore, the luminaire emits zero upward light. This means that it does not contribute to skyglow and it minimises any possibility of light pollution.