CRI = Color Rendering Idac, or how true colors appear (the # is percent, usually 70, 80, or 90).
Color Temperature = how blue versus yellow the light appears.
Lumen output is usually “raw lumens” (or the light output of the actual LEDs, but sometimes “effective lumens” (raw - loses, with loses higher with cheaper optics and lenses).
Everything else is quality of design and materials, with you can tell by a data sheet.