In pratice and if you read the web page of that other German therapist offering LLLT on the lumomed device, past the 3 months mark after trauma it's really unrealistic to expect major improvements
@Reinier you started LT 12 months after trauma that's well past the acute phase
I started 1 month after trauma and I think it did help for the first months.
But since those new lamps are so cheap and it's fairly safe without side effects, it's always worth a try now.
And if you are again subjected to a new trauma then you can start ASAP and regenerate your hair cells like in then study maybe ..