Table. 1.

Typical S/P ratio values by lightings [2].

Lamp Type Typical S/P Ratio
Low-Pressure Sodium 0.25
High-Pressure Sodium 0.66
Halogen Headlamp 1.43
Linear Fluorescent 1.3 to 2.3
Metal Halide 1.26 to 2.1
Warm White LED 1.21
Cool White LED 2.04
New Phys.: Sae Mulli 2021;71:879~884 https://doi.org/10.3938/NPSM.71.879
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