bindibadgi
Flashlight Enthusiast
Re: Carclo Precision Optics Review and Others....
I think it's the full width at half maximum (FWHM). That's the ususal. The full width of the beam, out to where it's half the brightness of the centre.
I think it's the full width at half maximum (FWHM). That's the ususal. The full width of the beam, out to where it's half the brightness of the centre.