High efficiency LED lamp for Off-Grid applications, e.g. chalet, tent, caravan. Through its very low power consumption it can be used with a 5 W solar panel and a small battery of 4 Ah only for a light time of 16 hours. Thus the total system cost can be reduced to a minimum. The light output is comparable to a 12 W halogen spot, with the benefit of long life span of > 40.000 hours.