In Germany, the Lightoven can be used nearly all year through. The figure below shows a typical distribution of times during which cooking is possible in the course of one year.
Thanks to its design, the Lightoven I is particularly suitable for low and medium solar altitudes. The Sun's angle of incidence (angle between the solar rays and the surface normal) should be between 20° and 60°.
If you travel to far-away countries, please note that, since the solar altitude depends on the geographical latitude, the service time will vary depending on the distance between your location and the Equator. In tropical areas, where the Sun is nearly directly overhead at solar noon, optimum use can be made of the Lightoven I mainly in the morning and evening hours. In northern areas, you can use it in the hours around noon provided that the Sun's intensity is sufficient. For exact information you can click here and determine the solar altitude for your desired location and time.