| Old lamps | IRC | ||
| Op. hours/year | 3 000 | same | |
| Lamp life | 4 000 | same | |
| Lamp wattages | 65W | 50W | |
| Nos. of lamps | 300 | same | |
| Price/kW/year | SEK0.60 (8cent) | same | |
| Total kWh/year | 58 500 | 45 000 | |
| Lamp cost/pc | SEK 30 | SEK 40 | |
| Costs for 225 lamps/year | 6 750 | 9 000 | |
| Electr. cost/year | 35 100 | 27 000 | |
| Total op. cost/year | 41 850 | 36 000 | |
| Saving IRC | SEK 5 850 ($780) | ||