Red light violation although traffic light was orange

About the history: 3 weeks ago I had the luck to meet a civilian policeman on a very unexploited highway. At that time, I did not know that it was a policeman. Because I was on the road quite fast, I had also overtaken him (E34 525i – 1 official) The car followed me for a while. At a traffic light I turned off on the right-hand side lane at orange. This was a 2 phase traffic light, “out/orange/red”. After that I was stopped by him. Because of the speed, he can’t do anything to me, because the time was too short for the measurement. So today came post, 3 points and 75€ due to red light violations. According to the witness, the traffic light turned a car length in front of me on red. I’m sure it was still orange. In addition, the official was 100m behind me. I don’t think you can see on the distance whether I’m just driving over the traffic light or still a car length in front of it!?!? What can I do now? E Is that a statement against a statement that he has no witness, no proof?