The data sheet usually indicates the power consumed and the luminous flux in lumens. The luminous flux per watt can be calculated from this, but this does not allow any direct statement about the degree of efficiency.
Unfortunately, the Radiant Flux is only given for special LED emitters.
Since the luminous flux is a measure perceptual to the human eye, it cannot easily be converted into power [W]. Isn't there still an approximation with which this is possible taking into account the light temperature? The spectra of the white LED do not differ in principle, since a blue LED is usually used and part of the blue light is converted into other spectral colors.
This information would be useful for the purpose of correctly dimensioning the cooling capacity.