That is the question.
I've spent several mornings researching RLT and while I've found a few small clinical trials and descriptions of various kinds of light therapy (see apdaparkinson.org/article/l..., as well as self-promoting ads by device producers hyping their products and criticizing others ( see symbyxbiome.com/products/pd... and vielight.com/?gad=1&gclid=E... and bestqool.com/?gclid=EAIaIQo... and many more , I haven't figured out whether or not to buy a RL device, and which to buy.
I've found that prices range anywhere form $150.- to $2,400.- , with no indication as to which device is most effective for Parkinsonians.
Should I hurry up and buy one of the RL products, or wait years until the data comes in?