RSA Testing
TL;DR: The REIN switch is a beast but it would still be nice to have more switch options like a single button one and a dual REIN/Crane switch.
Now to the details.
From the beginning the RSA's one goal was to provide options for people to run different switches. However there's no such thing as free lunch.
Take the following data with a grain of salt seeing that this is a sample size of one across the board. This is also with an off the shelf lux meter and it has no NIST certificates, although the same meter was used for all tests at the same distance.
Started the test comparing a combination of RSA with a DS00 tailcap vs the REIN's switch. As you can see in the chart below there is a difference in output. People argue at what point a human eye would be able to see the difference but at this range the difference is most likely visible.
Wondering where the step down might lie I decided to add another adapter that was made alongside the RSA called the ROSS, which is to add a REIN switch to a Surefire tailed light. As you can see the increase in output compared to the RSA is substantial. Now this is an addition of an RSA adapter, an RSA spring insert, and a ROSS adapter. That's a lot of extra steps to get the current where it has to go.
Note on the Surefire DF test. The RSA DS00 is not actually running an RSA, it's just a DS00.
Attached PDF to the page for a better resolution chart because Facebook really compresses pictures.
Formula for conversion:
Iv(cd) = 0.09290304 × Ev(lx) × (d(ft))2