10 60.000 € 70.000 € Jahre0 1 2 3 4 5 6 7 8 9 1011121314151617181920 50.000 € 40.000 € 30.000 € 20.000 € 10.000 € 0 € (red = HQI, green = LED) 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 Sample figure Cost savings per year €2120.90 Amortisation period approx. 9 months Type of luminaire Before: Halogen-metal vapour 250 W afterwards: HiLED Pro 150 W Power consumption 272 watts (incl. ballast) 150 watts Chip Service Life (L70) approx. 11,000 hours approx. 80,000 hours Required number of lights for 200 lux 20 pieces 15 pieces Total connected load in the stable 5440 watts 1800 watts Energy consumption per year (2190 h) 11.913,60 kWh 3.942 kWh Investment costs for 12 LED lights 1.548 € Energy costs per year (€0.25 /kWh) 2.978,40 € 985,50 € Costs for lamp replacement, annualised 128 € Total costs per year 3.106,40 € 985,50 € Cost savings per year 2.120,90 € Amortisation period approx. 9 months total cost savings after 20 years 42.418 € Invest now
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