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Table 2 Lighting effect at different vector/scalar ratio

From: Evaluations of Low ambient task - surround lighting system in a simulated environment

Vector/Scalar ratio Flow of light (Dimensionality) Appearance
3.5 Dramatic Theatrical
3.0 Very strong Strong contrast, details not discernable
2.5 Strong Suitable for display, too harsh for faces
2.0 Moderately strong Pleasant for distant face
1.5 Moderately weak Pleasant for near faces
1.0 Weak Soft lighting for subdued effects
.5 Very weak Flat, shadow free lighting