Kingston Waste Transfer Site

The busy Villiers Road Recycling Centre in Kingston upon Thames has recently undergone a lighting system upgrade from existing enclosed HID high bay luminaires to the latest LED technology high bay Haloprism fittings from Holophane. The existing lighting was provided by a blended scheme consisting of High Pressure Sodium and Metal Halide high bay luminaires which provided an initial designed average of 100 Lux on the working plane. Over time a thick layer of dust built up on the enclosure beneath the reflectors resulting in a very poor light output and inefficient operation. The reduced output had degraded the light level considerably to the point where the health and safety of the workforce was called into question. Lamp life was also a problem with the average life being approximately 20,000 hours resulting in high maintenance costs due to difficult access and the need to either pay for the work to be done at night, or to stop work during the day to accommodate the lamp changing process.

The need to save energy and cut back on these maintenance costs, whilst at the same time boosting the light level, meant that The Royal Borough of Kingston-Upon-Thames had to plan an effective refurbishment. Finding a solution that ticked all of those boxes was proving to be difficult.

After looking at many conventional options Richard Bedford (Electrical Design Engineer and Project Manager for The Royal Borough of Kingston-Upon-Thames) decided to contact Holophane for advice. After some analysis by the Holophane Lighting Design team it became clear that an LED based solution was required and the new Holophane Haloprism was put forward and trialled against other LED highbay products at the site. The Haloprism stood out as by far the most effective product in the trial in terms of both its light output and glare control.

“Holophane helped us throughout the design process and ultimately enabled us to deliver the project within budget and on time” stated Richard when asked about the help given to him by Holophane. “The Haloprism luminaire is the only really viable LED based highbay replacement product on the market at the moment” he added.

An energy monitoring system was installed before the changeover of the lighting to monitor energy usage and the results have been impressive. The original HID lighting was running at 45.40kWh and the new LED scheme is using 38.77kWh which equates to a 14.6% reduction in kWh whilst at the same time the light level has increased from 100 Lux to 300 Lux on the working plane.

When asked about the additional savings, due to the reduction in maintenance costs, Richard stated “The original HID lighting had a lamp life of approximately 20,000 hours but the new LED lighting has an expected life of 100,000 hours which is a massive improvement. Due to the high cost of lamp replacement with the original scheme we expect to save around 30% on combined energy and maintenance costs over the next five years”.

The uniformity is vastly improved too and the vertical illuminance has been greatly enhanced with the most noticeable improvement being to the rear wall of the tipping hall. The unique self-cleaning action of the Haloprism product ensures that the light levels will stay high too as the build-up of dust experienced with the old IP54 highbays won’t be an issue. On top of all that, the thermally managed Haloprism product provides a 100,000 hour life eradicating the cost of lamp replacement completely.

Steve Hack the manager of the site is delighted with the vastly improved lighting within the transfer station. “The new lighting has made a big difference to the lit effect and working conditions with the site”. He went on to add “With regards to the machine drivers the new lighting enables them to see more clearly what they are picking up and loading into the collection vehicles, as the old lighting provided a yellow light whereas new system gives us a crisp white light”.

The new lighting at the transfer station is a total success and has transformed the lit effect, visual acuity and overall efficiency at the site whilst at the same time helping the council to meet its carbon reduction goals and save money into the bargain.

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