Study on the Influence of LED Spectrum on the Visual and Nonvisual Effects in the Interior Zone of Tunnels

Table 4

Significance analysis for the above factors.

		CCT	CRI	Z-value	Visual luminance	Blue light hazard
CRI	r	0.000
		1.000
Z-value	r	0.877	0.418
		≤0.001	0.027
Visual luminance	r	0.798	0.499	0.939
		≤0.001	0.007	≤0.001
Blue light hazard	r	0.878	0.373	0.974	0.893
		≤0.001	0.051	≤0.001	≤0.001
Circadian action factory	r	0.874	0.370	0.976	0.880	0.983
		≤0.001	0.053	≤0.001	≤0.001	≤0.001

Correlation is significant at the 0.01 level (2-tailed). Correlation is significant at the 0.05 level (2-tailed).