Irradiance from sunlight (in colour; 50.9° N, on a sunny, hazy day at 10:50h in March 2016), irradiance from sunlight with clear synthetic glasses (solid line), irradiance from sunlight with synthetic sunglasses (dashed line), and irradiance from the new LED lamp at distances of 50 cm (see all other Figs), 25 cm, and 12.5 cm. The two spectacle lens types almost completely absorb UV radiation.