MBK -- let's parse my designs.
First, the RE. I expect Alla is exaggerating with 1,000 lumens. Following the 80-20 rule, that's 800 lumens. As you can see from the bulb shape, most of that light is directed sidewards, let's say 80% leaving 160 lumens directed rearwards. Unlike a headlight with both a polished forward-directed reflector and associated clear concentrating lens, the RE taillight is a red injection molded diffusing lens. As I recall the taillight housing doesn't have a reflector but some of those sidewards lumens are going to get reflected rearwards so maybe total rearwards luminous flux is 320 lumens. And that's only when the brakes are on.
There are two night-time riding scenarios of interest:
Stop-and-go in heavy traffic -- this can be in business districts where there are many other brighter distracting lights (eg, advertising) or open roads where my RE is just one brake light among many.
Continuous-flow traffic: I want my RE brake light to be noticed when that flow is interrupted.
So from my perspective 320 bright Red lumens is about right for the RE tail/brake light. But I also wanted a flasher brake light. No matter what your partner tells you, size matters including lens design. I also wanted something that sorta fit with the RE's rounded looks and chose the SBL PT-R24 with an SAE Code of STIP 03. SBL doesn't give lumens but it draws 0.31 amps so it's definitely bright. I only use the brake light function so my RE only has one tail light.
Yep I've got SBL's Amber LED 1156s, 310 lumens at 0.22 amps, for turn signals. The bulbs are so long I can't quite seal the cover to the housing. Still working on improving this solution. They too light sidewards and rearwards into the RE polished reflector housing. I needed really bright turn signals so they would be seen when the brakes are on.
While the MG has two big bright LED tail/brake lights, they are somewhat shadowed by the top case mounting base so I added the SBL PT-524 below the license plate so my brake light would be
seen by the eager driver of the lifted 4x4 with off-road tires 15 feet behind me. I included the flasher in hopes the driver would also
notice my brake light.
To ensure everyone recognizes me for the scofflaw that I am, I included pictures of my front illumination.
WRT my transportation milieu I invite you to SoCal where you can personally observe the awesomeness of vehicle lighting used for daily driving. I'm not even close to being a contender.