During Christmas time numerous fairylights are decorating houses and garden trees. Energy costs for these illuminations are however not neglectible. According to a German study two 9 m long conventional fairylight chains can amount within 6 weeks to about 30 Euros. If energy efficient rope lights with LEDs (light emitting diodes) are used, 80 percent of the energy and the costs can be saved.
A study performed by the German energy agency (dena) has analysed the energy consumption and energy costs of christmas illuminations. Boundary conditions were:electricity price of 21 cent/kWh
- conventional fairylights with 140 W and 9 m length
- LED rope light with 18.8 W and 8 m length
- illumination time: 6 weeks with 12 hours per day