Table 2 Preference index (PI) for spectral preference between different intensities of each LED color.

	combinations	mean PI	SEM	n	p value	p < α
1	V₁₀₀ vs. V₁₀	-0.0392	0.040	20	3.35.E-01	n.s.
2	B₁₀₀ vs. B₁₀	-0.0873	0.040	20	5.93.E-02^†	n.s.
3	G₁₀₀ vs. G₁₀	-0.0498	0.050	20	3.31.E-01	n.s.
4	Y₁₀₀ vs. Y₁₀	0.0918	0.038	20	2.74.E-02	n.s.
5	O₁₀₀ vs. O₁₀	0.0749	0.026	20	1.03.E-02	n.s.
6	R₁₀₀ vs. R₁₀	0.0406	0.040	20	3.27.E-01	n.s.

V, violet; B, blue; G, green; Y, yellow; O, orange; R, red; PI, preference index.
One sample t-tests were used to assess differences from zero; statistical significance is indicated by asterisks (*) for p < 0.05 after Bonferroni correction (adjusted α = 0.0083) †Wilcoxon signed-rank tests were used when data violated the assumption of normality (Shapiro-Wilk test).

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