def lab2hcl(l__, a__, b__):
    """L*a*b* to HCL
    """
    l2_ = (l__ - 9) / 61.0
    r__ = np.sqrt(a__*a__ + b__*b__)
    s__ = r__ / (l2_ * 311 + 125)
    angle = np.arctan2(a__, b__)
    c__ = np.rad2deg(np.pi / 3 - angle)%360
    return c__, s__, l2_