valgustus valgustite abil, mille valgustugevusjaotus on selline, et lõpmata suureks loetavale tööpinnale langeva valgusvoo osa valgusti koguvalgusvoost on 10% kuni 40%, lighting by means of luminaires having a distribution of luminous intensity such that the fraction of the emitted luminous flux directly reaching the working plane, assumed to be of infinite extent, is 0 to 10 %