Taken from Table 1(2.4.4) of Wysszecki and Stiles page 104 Monochromatic Stimuli
wavelength in(nm)	Factor to multiply photopic trd to get scot td

400			58.39
410			71.67
420			60.11
430			42.87
440			35.51
450			29.80
460			23.52
470			18.49
480 			14.20
490			10.82
500			7.57
510 			4.93
520			3.28
530			2.34
540			1.70
550			1.2
560			.822
570			.543
580			.347
590			.215
600			.131
610			.0788
620			.0481
630			.0313
640			.0213
650			.0157
660			.0128
670			.0115
680			.0105
690			.0107
700			.0108