Experts claim the light penetrates skin more deeply, which leads to more sweat and a higher release of toxins.

In the open sea, only about one per cent of light penetrates to a depth of 200 metres.

Corals often contain photosynthetic symbionts and live in shallow waters where light penetrates.

Light penetrates into the building through windows opened on alternate sides, which illuminate the arms of the cross-shaped interior.

Most red light gets absorbed by the shade-intolerant canopy plants, but more of the far-red light penetrates the canopy, reaching the understory.