Abstract: A lighting device has multiple light sources each having a primary optics; and a secondary optics for the multiple light sources; such that at the secondary optics the radiation patterns emitted from the multiple light sources have a substantially uniform luminance; and such that the secondary optics transforms the radiation pattern from the multiple light sources into an elliptical spot of light of substantially uniform luminance.

Abstract: Circuit for regulating a current applied to an electrical load, comprising a compensation unit comprising a temperature sensor and providing an electrical signal at an output, the electrical signal depending on the current applied to the electrical load and on a temperature measured by the temperature sensor, a reference unit providing a reference electrical signal, and a control unit regulating the current applied to the electrical load depending on a difference between the electrical reference signal and the electrical signal provided at the output of the compensation unit.