The Challenge

The Grand Arcade Car Park in Wigan is equipped with 216 Holophane Atlanta Luminaires which originally contained twin 55 Watt PLL lamps, each fitting consuming approximately 115 Watts when an additional allowance was made for the ballast consumption. A number of the existing luminaires were not operational as were a number of the integral emergency fittings. Light readings or LUX levels were recorded across the facility and in consultation with APCOA it was decided that increased light levels across the site would be desirable. Whilst a number of control systems such as timeclocks, PIR detectors and photocells were in place, during the onsite survey many were found to be inoperative or ineffective.

The Solution

Having carried out a detailed survey of the facility it was decided that the key objectives of the project should include increasing the overall lighting levels, ensuring the provision of adequate emergency lighting in line with current health and safety requirements and the reduction of energy consumption, including ongoing maintenance costs.
Having considered a number of optional approaches we provided proposals based on retrofitting the existing Holophane Atlanta fittings on a 1 for 1 basis with bespoke LED gear trays incorporating individual microwave motion detectors.
Unlike the existing twin 55 Watt PLL lamps consuming 115 Watts per fitting, the proposed a LED retrofit solution only consuming 58 Watts per fitting at full output. With the addition of individual microwave occupancy detectors this reduces to a mere 12 Watts when no occupancy is detected, whilst still providing adequate ambient or background light until occupancy is detected.
Based on 4499 hours annually (normal operating hours)?Existing conventional (fixed output) lighting system energy costs pre installation @£17,019.0 p.a.
This retrofit system energy costs post installation @ £5,105.70 p.a. Estimated total annual energy savings @£11,913.30