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. Author manuscript; available in PMC: 2015 Mar 11.
Published in final edited form as: Chronobiol Int. 2014 Oct 7;32(2):270–280. doi: 10.3109/07420528.2014.966269

TABLE 3.

Comparison between predicted photoreceptor excitations from the regression models and computed from the spectral distributions of the light sources.

Illuminants Photoreceptor excitations
Actiwatch outputs
Predicted photoreceptor Excitations
S M L R I W R G B SP Error MP Error LP Error RP Error IP Error
Office fluorescent 294 182 398 393 328 870 44 85 30 358 0.085 264 0.161 606 0.183 468 0.076 333 0.006
Sunny afternoon daylight 6158 2411 4728 6707 6477 4278 385 377 119 1279 0.682 1400 0.236 2879 0.215 3209 0.320 2696 0.381
Standard lamp 258 223 531 483 417 1528 197 119 43 509 0.296 487 0.340 1041 0.293 1147 0.375 1004 0.382