I use 6 resistors and put everything in parallel so that if one LED or
resistor goes bad the entire light does not go out.
Fresnel lenses are useful if the light is emitted in all directions.
In these LEDs, the light is emitted into a 45 degree cone so the
Fresnel lens is not too useful. My 6 LEDs are spaced so their cones
overlap.
As far as Shrodingers Cat goes, my next cat will be named "Psi" and her
kitten will be named "Eigenvalue".