I've been reading about many different types of light therapy one being a helmet but there are other forms.
I started doing red light therapy about 10 days ago. We bought a panel that hangs or stands like a full length mirror and I sit or stand close to it for 15 to 20 minutes. So far, no benefit I can point to, but it supposedly takes a few weeks of consistent use. I'm skeptical but there is research that indicates it can help with motor and non motor in PD. We'll see.