Actually the brightest/best tail lights as of today is:

Designshine ds500 at 800lm (out of production now)
Niteflux redzone 8 at 400lm (i have one)
Orfos red flare at 300lm (i have one)
Dinotte daytime red with I think maybe 300lm
Dinotte quad red 200lm

I'm not allowed to post links, so no links for you!