HW COATES, CAMBRIDGESHIRE
CASE STUDY

HW Coates have previously trialed several manufacturers for T5 and LED replacements with mixed results. The T5 solution proved to be problematic in cold weather and experienced high lamp failures due to high switching cycles. The original LED worked well for the first 9 months then rapid light depreciation and colour shift of the LED chips meant that lighting levels and colour rendering were below desired levels. The design brief was as follows:

🡆 To achieve 150 Lux maintained average at finished floor level.
🡆 Lighting control to be included for 10 zones within the 5 rows of racking.
🡆 Payback within 3 years, Warranty for materials and labour for 8 years through system supply Tridonic.
🡆 Programmable lighting to having dimming and switching capabilities
🡆 Complete within 21 days of awarding order.
🡆 Compliant with HazMat requirements for emergency lighting.

The Luminaires chosen by Bill Ball, Operations Director for HW Coates were the Swann Lighting Hercules for it’s performance, flexibility, price and warranty

Ensuring the correct lighting levels
The Lighting levels required for the Chemical storage and logistics according to the Society of Light an Lighting (table 2.9 Storage Rack Areas) whereby a maintained average illuminance of 150 lux and 0.4 uniformity are required.  
The requirement is for lighting at finished floor level with a 1:1 ratio for lighting on both the horizontal and vertical planes. This allows the visual adaption of the eye to be available to see over long distances, in this case over 90m per length of racking.

The three C's of high performance lighting - Carbon, Climate and Corporate Responsibility
The Carbon reduction achieved by the use of high performance lighting, is one of the best ways to reduce the burden using fossil fuels. We all know, that the increased use of fossil fuels with have an adverse effect on our climate, leading to more volatile weather systems, rising sea levels and an increased amount of greenhouse gases in the atmosphere. By reducing the amount of carbon (the main component in fossil fuels), we can keep a check on how much Carbon is released into the atmosphere. High performance lighting gives the greatest amount of light, for the least amount of energy used. In the case of HW Coates this lead to the design which only used six fittings per 90m run of racking and reduced the energy used in the Warehouses by 78% . The Corporate Responsibility of HW Coates came to the fore by undertaking the refit of their warehousing they reduced carbon by 13.41 tonnes per warehouse across the site. This is the equivalent to removing the carbon use of three family houses per year or boiling a kettle 10,395 times. The increased lighting performance also make the task easier for the staff, reduces misreading mistakes and quality issues and increases performance and well-being.

Achieving the best result
Lighting has two main costs in the estate, firstly the cost of use, the electricity charges and secondly the cost of maintenance. HW Coates were needing to reduce both these and Good Solid State Lighting (SSL) was the obvious choice.
Swann Lighting were able to develop a solution which met the requirements of a less than three years payback with a labour and material warranty for eight years. The reduction in nearly £1200 of maintenance and £2975 in energy per warehouse was achieved using the High Performance Lighting system of the Swann Lighting Hercules.

The Key Achievements are:-
Reduction in costs over £2975.00 per year
Reduction in green levies of £268.00 per year
Reduction in maintenance of £1200.00 per year
All eligible for Enhance Capital Allowance
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