valgustus valgustite abil, mille valgustugevusjaotus on selline, et lõpmata suureks loetavale tööpinnale langeva valgusvoo osa valgusti koguvalgusvoost on 90 % kuni 100 %
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 90 % to 100 %
