What does your openhab.log say? There may be an error. I’d test, but I’ve already spent WAY too much time with this one 
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This are all entries in the logfile for the LED Strip…
Your log is missing 
@linsenpago openHAB creates two logs: events.log and openhab.log. You have shown an extract from events.log - @5iver is asking for an extract from openhab.log.
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yes, i know… i did parse both logfiles - there are no entries in the openhab.log file
tail -f /var/log/openhab2/openhab.log /var/log/openhab2/events.log
2020-08-21 16:53:57.659 [ome.event.ItemCommandEvent] - Item 'Terrasse_LED_color' received command 336.03751102542196,2.6333844389829117,52.01465201465201
2020-08-21 16:53:57.689 [vent.ItemStateChangedEvent] - Terrasse_LED_color changed from 0.0,0.0,52.01465201465201 to 336.03751102542196,2.6333844389829117,52.01465201465201
2020-08-21 16:53:57.726 [ome.event.ItemCommandEvent] - Item 'Terrasse_LED_color_corrected' received command 150,4,52
2020-08-21 16:53:57.732 [nt.ItemStatePredictedEvent] - Terrasse_LED_color_corrected predicted to become 150,4,52
2020-08-21 16:53:57.815 [vent.ItemStateChangedEvent] - Terrasse_LED_color_corrected changed from 0,0,52 to 150,4,52
2020-08-21 16:53:57.999 [ome.event.ItemCommandEvent] - Item 'Terrasse_LED_color' received command 1.0021563238375908,91.72526045995023,52.01465201465201
2020-08-21 16:53:58.043 [vent.ItemStateChangedEvent] - Terrasse_LED_color changed from 336.03751102542196,2.6333844389829117,52.01465201465201 to 1.0021563238375908,91.72526045995023,52.01465201465201
2020-08-21 16:53:58.090 [ome.event.ItemCommandEvent] - Item 'Terrasse_LED_color_corrected' received command 118,92,52
2020-08-21 16:53:58.094 [nt.ItemStatePredictedEvent] - Terrasse_LED_color_corrected predicted to become 118,92,52
2020-08-21 16:53:58.109 [vent.ItemStateChangedEvent] - Terrasse_LED_color_corrected changed from 150,4,52 to 118,92,52
2020-08-21 16:53:58.610 [ome.event.ItemCommandEvent] - Item 'Terrasse_LED_color' received command 2.2457425658948793,100.0,52.01465201465201
2020-08-21 16:53:58.616 [vent.ItemStateChangedEvent] - Terrasse_LED_color changed from 1.0021563238375908,91.72526045995023,52.01465201465201 to 2.2457425658948793,100.0,52.01465201465201
2020-08-21 16:53:58.669 [ome.event.ItemCommandEvent] - Item 'Terrasse_LED_color_corrected' received command 118,100,52
2020-08-21 16:53:58.679 [nt.ItemStatePredictedEvent] - Terrasse_LED_color_corrected predicted to become 118,100,52
2020-08-21 16:53:58.699 [vent.ItemStateChangedEvent] - Terrasse_LED_color_corrected changed from 118,92,52 to 118,100,52
In looking again, I’m not sure what you mean. This looks OK to me. Red would be HSBType(“0,100,100”), but since you need to swap red and green, it would be HSBType(“120,100,100”). So, from your log, it looks to be working fine.