Summary comparison of emissions from sources to LE
Artificial incoherent radiation Luminous hazards- ELV and quantitative evaluation

Let's start with the sun, even though the sun is not an artificial form of radiation. Solar radiation is modeled by a black body at 5,800 K with an emission maximum at 520 nm, half of which is in the visible, the other half in the IR (25% of radiation is below 520 nm and 75% above, part of which is in the IR with V (λ) ≈ 0). UV represents around 1% of radiation. Solar irradiance at the earth's surface is around 1 kW · m^–2 (depending on surface location, atmospheric transparency, clouds...). This corresponds to a visual illuminance of around 10⁵ lx. The total power emitted by the sun is 4 × 10²⁶ W.

At 555 nm, wavelength with visual efficiency V (λ) = 1 lm (1 lumen (lm) represents 1/683 W, i.e. approx. 1.4 mW).

With the inaccurate...