The initial design for lighting the road and parking spaces proposed use of 250W high pressure sodium (SON), using 1.1m outreach brackets to reduce the setback to 4.9m. The proposal also included 100W SON lanterns on the same columns at 6m to light the walkway.
However, because of the low colour rendering of SON light sources, a decision was taken to switch the specification to LED. Working closely with the scheme’s landscape architects; BCA Landscape, we proposed an alternative design using a combination of Kirium 1 and Kirium 3 LED lanterns. Of particular benefit was the flexibility of Kirium, with its ability to tailor drive currents to increase light output, while still delivering high energy efficiency.
The final design uses 144W Kirium 3 lanterns running at 1A, mounted at 10m, supplemented by 17W Kirium 1 lanterns at 6m, running at 350mA. The result is a visually striking lighting installation with very good colour rendering and uniformity, and an installed electrical load that has been reduced by 189W per column, compared to the original SON design. We also supplied the columns, using a PSX paint finish to protect them from the harsh coastal environment.
In addition to the energy and carbon savings, Conwy County Borough Council will also benefit from reduced maintenance costs as a result of the extended life of LEDs.