LED 광 측정 단위
단위정의(Lumen, W) 1 watt at 555 nm = 683.0 lumens 전광선속(lumen) : 전공간(4p)으로 퍼져나가는 광선속 복사속(W) : 복사출력(radiant power) 복사의 형태로 방출, 전달, 입사된 빛의 단위 시간당의 에너지 1 watt at 555 nm = 683.0 lumens RADIANT FLUX: 1 W (watt) = 683.0 lm at 555 nm = 1700.0 scotopic lm at 507 nm 1 J (joule) = 1 W*s (watt * second) = 10 7 erg = 0.2388 gram * calories LUMINOUS FLUX: 1 lm (lumen) = 1.464 x 10 -3 W at 555 nm = 1/(4p) candela (only if isotropic)
단위정의(cd, W/sr) 광도(cd) : 단위 입체각으로 복사하는 광선속(lm/sr) RADIANT INTENSITY: 1 W/sr (watts per steradian) = 12.566 watts (isotropic) = 4 * p W = 683 candela at 555 nm LUMINOUS INTENSITY: 1 lm/sr (lumens per steradian) = 1 candela (cd) = 4 * p lumens (isotropic) = 1.464 x 10 -3 watts/sr at 555 nm
광 측정 단위 *sr : steradian Radiometric Unit Photometric English Radiant flux Watt Luminous flux Lumen Radiant Intensity Watt/sr Luminous Intensity candela Candela Radiance Watt/sr/m2 Luminance cd/m2 footLambert Irradiance Watt/m2 Illuminance lux Footcandle *sr : steradian
단위 변환