In view of the discussion on CO², energy efficiency is set to grow in importance. According to the German Electrical and Electronics Manufacturers‘ Association (ZVEI), 3.2 billion kWh of energy and 1.9 million tonnes of CO² could be saved every year in Germany on office lighting alone. One measure aimed at supporting such saving efforts is the EuP Directive 2005/32/EC (Eco-Design Requirements for Energy Using Products) which came into force in September 2009: Among other things, the directive envisages ninefficient products, e.g. for home and office lighting, being successively taken from the market. In comparison, using Nimbus LED luminaires can save up to 70 % in energy costs. Although the purchase price of a Nimbus LED luminaire may currently be around 20–30 % higher than that of a comparable conventional Nimbus luminaire, the higher purchase price will have paid for itself within just a short time, thanks to the significantly lower operating and maintenance costs. Nimbus LED luminaires are also outstanding in terms of their fixture efficiency and their long, fully maintenance-free lifetime. The luminous flux per watt of the current LED is much higher than that of halogen low-voltage light and at 3000 kelvin colour temperature is currently between 80–90 lm/W. Replacing light bulbs and halogen lights with LED technology represents an important contribution to sustainability.