Two typical office buildings in Leicestershire have slashed energy bills by embracing direct and indirect illumination. Mark Burgess reports

The Penn Lloyd and Rutland Buildings are typical office properties. They are part of the administration offices of Leicestershire County Council and, typically, were fitted with old style batten fittings, each of which housed one or two 65W lamps.

Refurbishment, however, comes to all buildings, and an energy analysis showed that installation of modern fittings in the Penn Lloyd building could cut energy bills by as much as 62 per cent. The analysis showed that the total amount of electricity consumed every year was 120,000kWh.

Better all round

In contrast, the installation of Riegens semi-recessed Wave luminaires – which provide direct and indirect illumination with pairs of high output T5 lamps rated at 24W – would produce a more uniform light level and use less than half the power of the old fittings.

Riegens produced a smaller version of Wave to fit into the 1970s ceiling troughs. This meant the lights were consistent between both buildings and cut wiring costs for the project.

Daylight response

All of the luminaires are controlled using the Philips Occuplus System, which provides absence and presence detection and daylight monitoring that adjusts the light levels in response to the amount of daylight.

Concido DL Eco downlighters have been fitted in the corridors in both buildings. They contain a recessed single or twin fluorescent lamp surrounded by a mirror-finish reflector for a high lumen output.

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