Replacing lamps in stations in Bielefeld (moBiel)

REPLACING LAMPS IN STATIONS IN BIELEFELD (MOBIEL)moBiel operates four tram lines, all crossing the city centre in a tunnel section with underground stations. At the main station, moBiel replaced the existing T8 lamps with newer more efficient T5 lamps (both lamp types are fluorescent lights).

This took place in 2010, bringing down the energy use from 49,000 kWh to 26,000 kWh per year. The same amount of light is now emitted with 74 lamps (replacement every four years) instead of 115 lamps (replacement every two years). The reduction in energy costs and maintenance/replacement compensates for the majority of the higher purchase price of the new lamps. Following the success of the first project, a second station (Wittekindstrasse) has been deployed with the new lamps the first months of 2014.

Technical data

Investment costs (€)

€25,500 (replacement of 55 lamps)

Staff resources (days)

None (done during normal maintenance work)

Energy savings (%)


Annual energy savings (kWh)

21,000 kWh

Annual CO2 savings (TCO2)

11 TCO2

Annual cost savings (€)

€3,100 (energy savings) and €2,250 (maintenance savings)

Payback time (years)

5 years