colour.sd_mesopic_luminous_efficiency_function#

colour.sd_mesopic_luminous_efficiency_function(L_p: float, source: Literal['Blue Heavy', 'Red Heavy'] | str = 'Blue Heavy', method: Literal['MOVE', 'LRC'] | str = 'MOVE', photopic_lef: SpectralDistribution | None = None, scotopic_lef: SpectralDistribution | None = None) SpectralDistribution[source]#

Return the mesopic luminous efficiency function \(V_m(\lambda)\) for given photopic luminance \(L_p\).

Parameters:
  • L_p (float) – Photopic luminance \(L_p\).

  • source (Literal['Blue Heavy', 'Red Heavy'] | str) – Light source colour temperature.

  • method (Literal['MOVE', 'LRC'] | str) – Method to calculate the weighting factor.

  • photopic_lef (SpectralDistribution | None) – \(V(\lambda)\) photopic luminous efficiency function, default to the CIE 1924 Photopic Standard Observer.

  • scotopic_lef (SpectralDistribution | None) – \(V^\prime(\lambda)\) scotopic luminous efficiency function, default to the CIE 1951 Scotopic Standard Observer.

Returns:

Mesopic luminous efficiency function \(V_m(\lambda)\).

Return type:

colour.SpectralDistribution

References

[Wikipedia05c]

Examples

>>> from colour.utilities import numpy_print_options
>>> with numpy_print_options(suppress=True):
...     sd_mesopic_luminous_efficiency_function(0.2)  
...
SpectralDistribution([[ 380.        ,    0.000424 ...],
                      [ 381.        ,    0.0004781...],
                      [ 382.        ,    0.0005399...],
                      [ 383.        ,    0.0006122...],
                      [ 384.        ,    0.0006961...],
                      [ 385.        ,    0.0007929...],
                      [ 386.        ,    0.000907 ...],
                      [ 387.        ,    0.0010389...],
                      [ 388.        ,    0.0011923...],
                      [ 389.        ,    0.0013703...],
                      [ 390.        ,    0.0015771...],
                      [ 391.        ,    0.0018167...],
                      [ 392.        ,    0.0020942...],
                      [ 393.        ,    0.0024160...],
                      [ 394.        ,    0.0027888...],
                      [ 395.        ,    0.0032196...],
                      [ 396.        ,    0.0037222...],
                      [ 397.        ,    0.0042957...],
                      [ 398.        ,    0.0049531...],
                      [ 399.        ,    0.0057143...],
                      [ 400.        ,    0.0065784...],
                      [ 401.        ,    0.0075658...],
                      [ 402.        ,    0.0086912...],
                      [ 403.        ,    0.0099638...],
                      [ 404.        ,    0.0114058...],
                      [ 405.        ,    0.0130401...],
                      [ 406.        ,    0.0148750...],
                      [ 407.        ,    0.0169310...],
                      [ 408.        ,    0.0192211...],
                      [ 409.        ,    0.0217511...],
                      [ 410.        ,    0.0245342...],
                      [ 411.        ,    0.0275773...],
                      [ 412.        ,    0.0309172...],
                      [ 413.        ,    0.0345149...],
                      [ 414.        ,    0.0383998...],
                      [ 415.        ,    0.0425744...],
                      [ 416.        ,    0.0471074...],
                      [ 417.        ,    0.0519322...],
                      [ 418.        ,    0.0570541...],
                      [ 419.        ,    0.0625466...],
                      [ 420.        ,    0.0683463...],
                      [ 421.        ,    0.0745255...],
                      [ 422.        ,    0.0809440...],
                      [ 423.        ,    0.0877344...],
                      [ 424.        ,    0.0948915...],
                      [ 425.        ,    0.1022731...],
                      [ 426.        ,    0.109877 ...],
                      [ 427.        ,    0.1178421...],
                      [ 428.        ,    0.1260316...],
                      [ 429.        ,    0.1343772...],
                      [ 430.        ,    0.143017 ...],
                      [ 431.        ,    0.1518128...],
                      [ 432.        ,    0.1608328...],
                      [ 433.        ,    0.1700088...],
                      [ 434.        ,    0.1792726...],
                      [ 435.        ,    0.1886934...],
                      [ 436.        ,    0.1982041...],
                      [ 437.        ,    0.2078032...],
                      [ 438.        ,    0.2174184...],
                      [ 439.        ,    0.2271147...],
                      [ 440.        ,    0.2368196...],
                      [ 441.        ,    0.2464623...],
                      [ 442.        ,    0.2561153...],
                      [ 443.        ,    0.2657160...],
                      [ 444.        ,    0.2753387...],
                      [ 445.        ,    0.2848520...],
                      [ 446.        ,    0.2944648...],
                      [ 447.        ,    0.3034902...],
                      [ 448.        ,    0.3132347...],
                      [ 449.        ,    0.3223257...],
                      [ 450.        ,    0.3314513...],
                      [ 451.        ,    0.3406129...],
                      [ 452.        ,    0.3498117...],
                      [ 453.        ,    0.3583617...],
                      [ 454.        ,    0.3676377...],
                      [ 455.        ,    0.3762670...],
                      [ 456.        ,    0.3849392...],
                      [ 457.        ,    0.3936540...],
                      [ 458.        ,    0.4024077...],
                      [ 459.        ,    0.4111965...],
                      [ 460.        ,    0.4193298...],
                      [ 461.        ,    0.4281803...],
                      [ 462.        ,    0.4363804...],
                      [ 463.        ,    0.4453117...],
                      [ 464.        ,    0.4542949...],
                      [ 465.        ,    0.4626509...],
                      [ 466.        ,    0.4717570...],
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                      [ 469.        ,    0.4995075...],
                      [ 470.        ,    0.5096145...],
                      [ 471.        ,    0.5191293...],
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                      [ 477.        ,    0.5810207...],
                      [ 478.        ,    0.5919093...],
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                      [ 485.        ,    0.6687841...],
                      [ 486.        ,    0.6797939...],
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                      [ 488.        ,    0.7023827...],
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                      [ 498.        ,    0.8130793...],
                      [ 499.        ,    0.8239297...],
                      [ 500.        ,    0.8352251...],
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                      [ 502.        ,    0.8564818...],
                      [ 503.        ,    0.8676921...],
                      [ 504.        ,    0.8785021...],
                      [ 505.        ,    0.8881489...],
                      [ 506.        ,    0.8986405...],
                      [ 507.        ,    0.9079322...],
                      [ 508.        ,    0.9174255...],
                      [ 509.        ,    0.9257739...],
                      [ 510.        ,    0.9350656...],
                      [ 511.        ,    0.9432365...],
                      [ 512.        ,    0.9509063...],
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                      [ 514.        ,    0.9658413...],
                      [ 515.        ,    0.9722825...],
                      [ 516.        ,    0.9779924...],
                      [ 517.        ,    0.9836106...],
                      [ 518.        ,    0.9883465...],
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                      [ 521.        ,    0.9976202...],
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                      [ 523.        ,    1.       ...],
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                      [ 526.        ,    0.9975356...],
                      [ 527.        ,    0.9957615...],
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                      [ 531.        ,    0.9814453...],
                      [ 532.        ,    0.9766885...],
                      [ 533.        ,    0.9709363...],
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                      [ 536.        ,    0.952012 ...],
                      [ 537.        ,    0.9444916...],
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                      [ 539.        ,    0.9293506...],
                      [ 540.        ,    0.9210429...],
                      [ 541.        ,    0.9124772...],
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                      [ 547.        ,    0.8559224...],
                      [ 548.        ,    0.8456846...],
                      [ 549.        ,    0.8352499...],
                      [ 550.        ,    0.8253229...],
                      [ 551.        ,    0.8152079...],
                      [ 552.        ,    0.8042205...],
                      [ 553.        ,    0.7944209...],
                      [ 554.        ,    0.7837466...],
                      [ 555.        ,    0.7735680...],
                      [ 556.        ,    0.7627808...],
                      [ 557.        ,    0.7522710...],
                      [ 558.        ,    0.7417549...],
                      [ 559.        ,    0.7312909...],
                      [ 560.        ,    0.7207983...],
                      [ 561.        ,    0.7101939...],
                      [ 562.        ,    0.6996362...],
                      [ 563.        ,    0.6890656...],
                      [ 564.        ,    0.6785599...],
                      [ 565.        ,    0.6680593...],
                      [ 566.        ,    0.6575697...],
                      [ 567.        ,    0.6471578...],
                      [ 568.        ,    0.6368208...],
                      [ 569.        ,    0.6264871...],
                      [ 570.        ,    0.6161541...],
                      [ 571.        ,    0.6058896...],
                      [ 572.        ,    0.5957000...],
                      [ 573.        ,    0.5855937...],
                      [ 574.        ,    0.5754412...],
                      [ 575.        ,    0.5653883...],
                      [ 576.        ,    0.5553742...],
                      [ 577.        ,    0.5454680...],
                      [ 578.        ,    0.5355972...],
                      [ 579.        ,    0.5258267...],
                      [ 580.        ,    0.5160152...],
                      [ 581.        ,    0.5062322...],
                      [ 582.        ,    0.4965595...],
                      [ 583.        ,    0.4868746...],
                      [ 584.        ,    0.4773299...],
                      [ 585.        ,    0.4678028...],
                      [ 586.        ,    0.4583704...],
                      [ 587.        ,    0.4489722...],
                      [ 588.        ,    0.4397606...],
                      [ 589.        ,    0.4306131...],
                      [ 590.        ,    0.4215446...],
                      [ 591.        ,    0.4125681...],
                      [ 592.        ,    0.4037550...],
                      [ 593.        ,    0.3950359...],
                      [ 594.        ,    0.3864104...],
                      [ 595.        ,    0.3778777...],
                      [ 596.        ,    0.3694405...],
                      [ 597.        ,    0.3611074...],
                      [ 598.        ,    0.3528596...],
                      [ 599.        ,    0.3447056...],
                      [ 600.        ,    0.3366470...],
                      [ 601.        ,    0.3286917...],
                      [ 602.        ,    0.3208410...],
                      [ 603.        ,    0.3130808...],
                      [ 604.        ,    0.3054105...],
                      [ 605.        ,    0.2978225...],
                      [ 606.        ,    0.2903027...],
                      [ 607.        ,    0.2828727...],
                      [ 608.        ,    0.2755311...],
                      [ 609.        ,    0.2682900...],
                      [ 610.        ,    0.2611478...],
                      [ 611.        ,    0.2541176...],
                      [ 612.        ,    0.2471885...],
                      [ 613.        ,    0.2403570...],
                      [ 614.        ,    0.2336057...],
                      [ 615.        ,    0.2269379...],
                      [ 616.        ,    0.2203527...],
                      [ 617.        ,    0.2138465...],
                      [ 618.        ,    0.2073946...],
                      [ 619.        ,    0.2009789...],
                      [ 620.        ,    0.1945818...],
                      [ 621.        ,    0.1881943...],
                      [ 622.        ,    0.1818226...],
                      [ 623.        ,    0.1754987...],
                      [ 624.        ,    0.1692476...],
                      [ 625.        ,    0.1630876...],
                      [ 626.        ,    0.1570257...],
                      [ 627.        ,    0.151071 ...],
                      [ 628.        ,    0.1452469...],
                      [ 629.        ,    0.1395845...],
                      [ 630.        ,    0.1341087...],
                      [ 631.        ,    0.1288408...],
                      [ 632.        ,    0.1237666...],
                      [ 633.        ,    0.1188631...],
                      [ 634.        ,    0.1141075...],
                      [ 635.        ,    0.1094766...],
                      [ 636.        ,    0.1049613...],
                      [ 637.        ,    0.1005679...],
                      [ 638.        ,    0.0962924...],
                      [ 639.        ,    0.0921296...],
                      [ 640.        ,    0.0880778...],
                      [ 641.        ,    0.0841306...],
                      [ 642.        ,    0.0802887...],
                      [ 643.        ,    0.0765559...],
                      [ 644.        ,    0.0729367...],
                      [ 645.        ,    0.0694345...],
                      [ 646.        ,    0.0660491...],
                      [ 647.        ,    0.0627792...],
                      [ 648.        ,    0.0596278...],
                      [ 649.        ,    0.0565970...],
                      [ 650.        ,    0.0536896...],
                      [ 651.        ,    0.0509068...],
                      [ 652.        ,    0.0482444...],
                      [ 653.        ,    0.0456951...],
                      [ 654.        ,    0.0432510...],
                      [ 655.        ,    0.0409052...],
                      [ 656.        ,    0.0386537...],
                      [ 657.        ,    0.0364955...],
                      [ 658.        ,    0.0344285...],
                      [ 659.        ,    0.0324501...],
                      [ 660.        ,    0.0305579...],
                      [ 661.        ,    0.0287496...],
                      [ 662.        ,    0.0270233...],
                      [ 663.        ,    0.0253776...],
                      [ 664.        ,    0.0238113...],
                      [ 665.        ,    0.0223226...],
                      [ 666.        ,    0.0209086...],
                      [ 667.        ,    0.0195688...],
                      [ 668.        ,    0.0183056...],
                      [ 669.        ,    0.0171216...],
                      [ 670.        ,    0.0160192...],
                      [ 671.        ,    0.0149986...],
                      [ 672.        ,    0.0140537...],
                      [ 673.        ,    0.0131784...],
                      [ 674.        ,    0.0123662...],
                      [ 675.        ,    0.0116107...],
                      [ 676.        ,    0.0109098...],
                      [ 677.        ,    0.0102587...],
                      [ 678.        ,    0.0096476...],
                      [ 679.        ,    0.0090665...],
                      [ 680.        ,    0.0085053...],
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                      [ 688.        ,    0.00477  ...],
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                      [ 690.        ,    0.0041081...],
                      [ 691.        ,    0.0038149...],
                      [ 692.        ,    0.0035456...],
                      [ 693.        ,    0.0032984...],
                      [ 694.        ,    0.0030718...],
                      [ 695.        ,    0.0028639...],
                      [ 696.        ,    0.0026738...],
                      [ 697.        ,    0.0025000...],
                      [ 698.        ,    0.0023401...],
                      [ 699.        ,    0.0021918...],
                      [ 700.        ,    0.0020526...],
                      [ 701.        ,    0.0019207...],
                      [ 702.        ,    0.001796 ...],
                      [ 703.        ,    0.0016784...],
                      [ 704.        ,    0.0015683...],
                      [ 705.        ,    0.0014657...],
                      [ 706.        ,    0.0013702...],
                      [ 707.        ,    0.001281 ...],
                      [ 708.        ,    0.0011976...],
                      [ 709.        ,    0.0011195...],
                      [ 710.        ,    0.0010464...],
                      [ 711.        ,    0.0009776...],
                      [ 712.        ,    0.0009131...],
                      [ 713.        ,    0.0008525...],
                      [ 714.        ,    0.0007958...],
                      [ 715.        ,    0.0007427...],
                      [ 716.        ,    0.0006929...],
                      [ 717.        ,    0.0006462...],
                      [ 718.        ,    0.0006026...],
                      [ 719.        ,    0.0005619...],
                      [ 720.        ,    0.0005240...],
                      [ 721.        ,    0.0004888...],
                      [ 722.        ,    0.0004561...],
                      [ 723.        ,    0.0004255...],
                      [ 724.        ,    0.0003971...],
                      [ 725.        ,    0.0003704...],
                      [ 726.        ,    0.0003455...],
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                      [ 738.        ,    0.0001449...],
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                      [ 740.        ,    0.0001249...],
                      [ 741.        ,    0.0001159...],
                      [ 742.        ,    0.0001076...],
                      [ 743.        ,    0.0000999...],
                      [ 744.        ,    0.0000927...],
                      [ 745.        ,    0.0000862...],
                      [ 746.        ,    0.0000801...],
                      [ 747.        ,    0.0000745...],
                      [ 748.        ,    0.0000693...],
                      [ 749.        ,    0.0000646...],
                      [ 750.        ,    0.0000602...],
                      [ 751.        ,    0.0000561...],
                      [ 752.        ,    0.0000523...],
                      [ 753.        ,    0.0000488...],
                      [ 754.        ,    0.0000456...],
                      [ 755.        ,    0.0000425...],
                      [ 756.        ,    0.0000397...],
                      [ 757.        ,    0.0000370...],
                      [ 758.        ,    0.0000346...],
                      [ 759.        ,    0.0000322...],
                      [ 760.        ,    0.0000301...],
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                      [ 763.        ,    0.0000244...],
                      [ 764.        ,    0.0000228...],
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                      [ 766.        ,    0.0000198...],
                      [ 767.        ,    0.0000185...],
                      [ 768.        ,    0.0000173...],
                      [ 769.        ,    0.0000161...],
                      [ 770.        ,    0.0000150...],
                      [ 771.        ,    0.0000140...],
                      [ 772.        ,    0.0000131...],
                      [ 773.        ,    0.0000122...],
                      [ 774.        ,    0.0000114...],
                      [ 775.        ,    0.0000106...],
                      [ 776.        ,    0.0000099...],
                      [ 777.        ,    0.0000092...],
                      [ 778.        ,    0.0000086...],
                      [ 779.        ,    0.0000080...],
                      [ 780.        ,    0.0000075...]],
                     SpragueInterpolator,
                     {},
                     Extrapolator,
                     {'method': 'Constant', 'left': None, 'right': None})