Both sets of emergency lights were found to be running all day, every day throughout the survey periods, with the Emergency lights accounting for 25.38% of the total light energy usage.
Hence one of the conclusions of the exercise was to investigate further if any savings could be made in this area, perhaps bringing the emergency lights under the control of the existing light control panel to work in line with current shift pattern.
The potential saving of this was calculated to be around 50 % off the current emergency light usage, amounting to an annual saving of £2687. It would involve adjustment of 141 fittings, with a rewiring time 30 minutes per fitting for a total of 70 hours work approximately, giving a financial payback of less than 1 year.
Two further opportunities for energy efficiency improvements were also found:
- Complete the rollout of LED light fittings. 8 % of lights were still to be changed over to LED. This was estimated to be a potential saving of a further 17739 kWh per year, equivalent to £1773.00 estimated saving per annum.
- Program the Light Control Panel to schedule lights on/off in line with production and office hours, this was estimated to give a further saving of 5 % of light energy usage. An estimated saving of 7894 kWh per annum, amounting to a value saving of £789.00 each year.
Based on this relatively simple survey of lighting practices using the Profile Portable Energy Recorder, an ongoing annual saving of over £5200 was identified.