A decade of expercience with solar lighting tought us, that we need a relation of 10:1 between the PV performance and the LED performance. One can ensure operation in Middle Europe during winter only under these circumstances. This means: 300W PV performance equals 30W lighting performance Photinus solutions range between 3-30 W lighting performance and between some 300 – 3000 lm luminous flux. Be aware, that some competitor use values of summer operation in their data sheets.