This review article focuses on clinical studies published in the fields of (i) photorejuvenation and anti-ageing, (ii) oily or acne-prone skin and related imperfections, (iii) skin pigmentation and lightening, (iv) dandruff and other Malassezia-related skin disorders and (v) prevention and reversal of hair loss using non-thermal, non-ablative devices (principally light-emitting diodes). It mainly focuses on clinical proof of performance and also on in vitro studies that support the clinical findings. The mode of action of narrowbands of visible light upon the skin is only briefly discussed since their biological effects have been previously reviewed.
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Andrew Greaves (2015) studied this question.
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