11 60.000 € 50.000 € 40.000 € 30.000 € 20.000 € 10.000 € 0 LED Indoor Spotlight Conversion to LED technology Investment calculation using a dairy stable as an example Halogen metal halide lamps (HQI/HIE) are frequently the first choice for stable lighting due to their relatively good luminous efficacy and colour rendering. The following example shows, however, that a conversion to LED technology can pay for itself quite quickly. Dairy stable with 40 x 24 metres Installation height of the lights 6 metres Average lighting strength approx. 200 lux Average burning life of 6 hours per day Cost trend over 20 years Cost savings per year €1,525 Amortisation period 2.5 years Type of luminaire Before: Halogen-metal vapour 250 W After: LED Indoor Spotlight 150 W Power consumption 272 watts (incl. ballast) 150 watts Power consumption 272 watts (incl. ballast) 150 watts Service life of the light source approx. 11,000 hours (= 5 years at a burning life of 6 h/day) approx. 100,000 hours (= 45 years at a burning life of 6 h/day) Required number of lights for 200 lux 20 pieces 15 pieces Total connected load in the stable 5440 watts 2250 watts Energy consumption per year (2190 h) 11,914 kWh 4928 kWh Investment costs for 15 LED lights 3.735 € Energy costs per year (€0.20 /kWh) 2.383 € 986 € Costs for lamp replacement, annualised 128 € Total costs per year 2.511 € 986 € cost savings per year €1,525 Amortisation period 2.5 years total cost savings after 20 years €26,765 Sample figure

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