Plants primarily need light which corresponds to the absorbance spectra of the major photosynthetic pigments - the basis for PPFD metrics.
Generating significant light in frequencies which do not fit the absorbance curves usually equates to wasted electricity.
See all the green light these “white” LEDs produce (520nm-560nm):
As far as I know, PAR meters generally measure the light according to a predefined curve - an approximation of the above curves for chlorophylls - and this predetermined curve may or may not fit your application. That is to say, you may want additional energy in certain frequencies not well represented, or less energy in others. For instance, light in the UVA-band seems to stimulate production of some secondary metabolites in many living things; some green can apparently be of use to some plants at some times…
I think highly of 7- or 9-band “full spectrum” LED grow fixtures, as they cover a wide area (not single point source), but tend to be pretty expensive.
If you’re feeling the DIY spirit, full-spectrum driverless grow COBs are hard to beat, thanks to low cost and simplicity, and usually offer a nice distribution of energy that generally fits the needs of plants well…
Could be faked data, but gives you an idea of what to expect, vs HPS:
I made this 50W 400nm-840nm “full-spectrum” grow COB light fixture for ~$20, all told:
Solder two wires, slap a CPU heatsink on it and mount!