Z 8725 : 1999 JIS Z 8725 : 1987 JIS Z 8725 1 2 3 (1)JISZ 8725 : 1999Methods for determining distribution temperature andcolor temperature or correlated color temperature of light sources1. 2. JIS C 7526 JIS C 7527 JIS Z 8105 JIS Z 8113 JIS Z 8120 JIS Z 8724 3. JIS Z 8105JIS Z 8113 JIS Z 8120 a) (1) R( )d0g =R( )d 0 (1)g (nm) (nm)R () b) 4.4 (4)2Z 8725 : 1999c) 4.4.1 2 2 4.3 b) 2.4.2 a)JIS C 7526 b)JIS C 7527 c) a)b) b) c) JIS C 7526 4. 4.3 a)JIS Z 8724 4.2B R 1.B R 460nm 660nm 5nm 2. JIS Z 8724 4.2 5nm b)SB()SR() 1.22. 3.JIS Z 8724 4.2.3(2) 4.2 SB()SR() g 460nm 660nm 3Z 8725 : 1999(2) 100nm S ( )dW = 0S (max ) (2)WS () maxSB() SR() S () 4.4 a) I 2 s t B R rs(B)rs(R)rt(B) rt(R) TD,s(K) TD,t(K) (3) 1rt (B ) rs (R ) =rt (R ) rs (B )Sb (B , TD,t ) Sb (R , TD, s )Sb (R , TD,t ) Sb (B , TD, s ) (3)Sb(TD) (4)Sb (,TD ) =C (4)c5 exp 2 1 C TD c2 1.438 8107nmK TD (K) (nm) b) II2 B R 1) IIa rB,srR,s (5) ps rB, sps =rR, s (5) rB,trR,t (6) pt rB,tp = (6)trR,tpt ps Vt TD,t(K) TD, s(K) 1. It 2.4.3b) 2. rBrR 2) IIb