Red Light therapy - I have heard it is used for body fat reduction, wouldn't you lose facial fat if used on face?

I was about to try red light-near infrared LED therapy for facial skin rejuvenation. I am trying to decipher all the info out there...can a dermatologist help me understand what nm wavelength is safest for the face. How it can be used on the body for contouring & also on the face for wrinkle reduction? If these theories are true, wouldn't you lose facial fat (I worry about this as I have a thin face)? The NASA study used 730nm. Should I stick with 600-730nm for the face or is 850nm NIR safe?

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