Control of the luminous intensity of power LEDs by using the photoelectric effect characteristics of said power LEDs

Signal lamp arrangement, in particular railway signal lamp arrangement, with a signal lamp comprising at least one light emitting diode (=LED) as its illuminant,

• and with an electronic circuit for operating the signal lamp,
• wherein
• that the electronic circuit comprises
• a supply means for supplying the at least one LED with operating current,
• a tapping means for tapping the LED voltage of the at least one LED,
• a comparison means for comparing the LED voltage to a reference voltage,
• wherein the comparison means is connected to the supply means for controlling the supply means,
• and a switching means for switching the electronic circuit from a first state into a second state and vice versa,
• wherein in the first state, the supply means is connected to the at least one LED, and the comparison means is disconnected form the at least one LED, in particular wherein the tapping means is disconnected from the comparison means,
• and wherein in the second state, the supply means is disconnected from the at least one LED, and the comparison means is connected to the at least one LED, in particular wherein the tapping means is connected to the comparison means.