Objectives: This study evaluated the effects of light intensity and color on facial dimensions measured along three axes (X, Y, and Z) using a structured-light 3D facial scanner. Methods: Forty-seven adults (mean age 25.7±3.4 years) underwent facial scanning under two light intensities (500 and 700 lux) and two light colors (daylight and cool white) generated from a softbox photography lighting setup. The scans were performed in a room illuminated with ambient daylight-color LED at 300 lux without external light interference. Facial measurements were analyzed using Dolphin Imaging Software. Two-way repeated measures ANOVA was used to assess the effects of light intensity, light color, and their interactions on facial measurements. Statistical significance was set at p<0.05. Results: Light intensity had no significant effect on 3D facial measurements (p>0.05). However, light color significantly influenced upper lip anterior-true vertical line through the alar base (ULA-TVL) and lower lip anterior-true vertical line through the alar base (LLA-TVL) measurements along the Z axis (p<0.05), with greater values recorded under daylight compared to cool white. No significant inte
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