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var _sourceColor, _hslColor, _hue, _saturation, _lightness;

_sourceColor = effect("Fill")("Color"); 
_hslColor = rgbToHsl(_sourceColor);

_hue = _hslColor[0];
_saturation = _hslColor[1];
_lightness = _hslColor[2] - .2; // Here you go

hslToRgb([_hue, _saturation, _lightness, 1]);