Out and About SPIE UK A50 Meir Tunnel Stoke-on-Trent, UK
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The A50 Meir Tunnel in Stoke-on-Trent needed a lighting upgrade; it was time to replace the fluorescent, high pressure sodium light sources with the latest LED technologies. The 284m Meir Tunnel now has improved visibility for drivers and the new lighting investment is estimated to payback in less than three years. The work was completed by the Industrial Services North West division of SPIE for AMEY, the principal contractor for the Highways Agency. The existing lighting was replaced with over 600 Philips T-line LED luminaries and completed one week ahead of schedule.
This new system uses two versions of the Philips T-line road tunnel luminaire to provide a true linear lighting scheme with exceptional uniformity and greatly improved colour rendering. Use of LED light sources allows instant start-up should there be a power failure, thus eliminating the potentially dangerous re-strike period needed for high pressure sodium
SAVING ENERGY AND MONEY
Philips LEDs deliver carbon and cost savings for Meir Tunnel.
lamps. The LED light sources are less susceptible to low ambient temperatures, which significantly reduces the lumen output of fluorescent lamps. During daylight hours, the lighting is dimmed continuously, in line with the dynamic external luminance (L20). As the natural daylight levels increase, so does the light output of the tunnel lighting to maintain a critical ratio that avoids drivers approaching a ‘black hole’. At night lower light level is maintained by dimming selected luminaires to complement the street lighting level on the approach roads. The wall mounted control panels in each plant room display status and alarms and allow maintenance reports to be generated.
This has reduced the annual energy consumption of the tunnel lighting from 660 MWh to 154 MWh, cutting carbon emissions by 275 per annum, with a financial saving on energy costs of nearly £64,000.
Contact SPIE UK
+44 (0)20 7105 2300
www.spieuk.com
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www.a1lightingmagazine.com
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