Physics of radiation in the field of optics and illuminating engineering; efficiencies Physique de rayonnement optique et technique d'éclairage; efficacités
DIN 5031-4:1982 history
1982DIN 5031-4:1982-03 Physics of radiation in the field of optics and illuminating engineering; efficiencies
1982DIN 5031-4:1982 Physics of radiation in the field of optics and illuminating engineering; efficiencies