Table 1.

Relationship of NIST and PTB units of luminous intensity (candela, cd) and luminous flux (lumen, lm) since 1985 CCPR intercomparison, relative to the world mean of 1985

Units	Participant	1985 CCPR intercomp.	1987 Bilateral intercomp.	1988 BIPM report	1990 New Int’n Temp. Scale	1992 NIST New unit	1993 Predicted
Candela	BIPM	1.0100		1.000			1.000
	PTB	1.0032		1.003			1.003
	NIST	0.9942		0.994	0.9977	1.0014	1.001
	PTB–NIST	0.0090		0.009	0.0055	0.0018	0.002
Lumen	BIPM	0.9930		1.000			1.000
	PTB	1.0056		1.006			1.006
	NIST	0.9899		0.990			0.990
	PTB–NIST	0.0157	0.017	0.016			0.016