Red light therapy - mask or panel?

My husband would like a red light therapy mask for his birthday. There are so many brands and types - what would be the best option? Also, does it matter if it’s a mask panel? Lastly, I’ve been reading conflicting info on the wavelengths- what would be the best?

Sorry for so many questions, there is just a lot of info and am unsure which path to take. TYIA!