Each of the light settings featured on the device help with these specific skin concerns at the different wavelengths measured in nano meters: Red light (630nm) has profound anti-ageing benefits, it stimulates collagen and elastin production and strengthens skin. This light setting also reduces inflammation, heals blemishes, repairs sun damage and improves scarring.Blue light (430nm) balances and clarifies the skin, treating acne. With repetitive use, this light improves blemished skin.Green light (520 nm) calms skin and reduces pigmentation, broken capillaries and sunspots.Yellow light (570-590nm) reduces redness and boosts circulation. It is ideal for sensitive skin as it boosts lymphatic flow and soothes the skin.White light (450-460nm) penetrates deeply to promote wound healing and skin repair.