Luminous efficiencies as derived in this work taking the stream association of the meteoroids into account, over the initial velocity of the objects with fits through the data displayed in semi-log space. Blue dots: values of τ; green solid line: weighted least squares fit (WLS) applied to the data, the method weights the values by the relative error of the value; orange dotted line: the results found by Halliday et al. (1996); purple dash-dotted line: the results found by Ceplecha & McCrosky (1976).