... visible light wave (380nm-760nm), and generate a spectral curve on reflectance and transmittance of objects ... in corresponding functions under GB3978 standard illuminant D65, A, C and 10°, 2° view of field. ... ΔY≤0.2l Instrument repeatability: ΔY≤0.2;ΔE≤0.02 (standard white board, mean of 10 ... , y; L*, a*, b*; L, a, b; L*, u*, v*; L*, c*, h*l Color difference: Δ E (L*a*b*); ΔE (Lab); ΔE (L*u*v*); ...