Intensité (en W/m^2) calculée avec l'aire sous la courbe de la radiance spectrale
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수식 9: "I" Subscript, 1 , Baseline equals Start integral from 0 to infinity , end integral, StartFraction, 2 pi "c" squared "h" left parenthesis, "x" , right parenthesis to the negative 5th power Over exp left parenthesis, StartNestedFraction, "h" "c" NestedOver left parenthesis, "x" , right parenthesis "k" "T" , EndNestedFraction , right parenthesis minus 1 , EndFraction "d" "x"I1=∫∞02πc2hx−5exphcxkT−1dx
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Radiance spectrale (en W/m^2/nm) en fonction de la longueur d'onde (en nm) calculée avec la loi de Planck
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수식 11: "R" equals StartFraction, 10 to the negative 9th power times 2 pi "c" squared "h" left parenthesis, lambda times 10 to the negative 9th power , right parenthesis to the negative 5th power Over exp left parenthesis, StartNestedFraction, "h" "c" NestedOver lambda times 10 to the negative 9th power "k" "T" , EndNestedFraction , right parenthesis minus 1 , EndFractionR=10−9·2πc2hλ·10−9−5exphcλ·10−9kT−1