Welky wrote:"Steve, was your rear lens TÜV approved? This is kind of a common problem with aftermarket LED lens kits, bit dangerous IMO. It sounds like the rear lens design is decreasing the LED intensity when viewing from obtuse angles."
Surely the only angle that is important is directly from behind so cars following are aware that a) you are braking, and b) that you can be seen at night. Looks like these lights do both, do I can't see the problem, but then I would say that having just bought some!

Errrrm, no!!!
Crossing a roundabout I'd like to know if you're braking BEFORE I got directly behind you!!!
OR
Following you around a hairpin (or even a 90 degree), I'd like to know if you're on the brakes!!!
OR
Following you down a hill into a dip, if you broke hard at the dip the angle would be obtuse to the following driver.
OR
If cornering and you're near-side rear cluster is obscured by road-side street furniture etc and your off-side rear cluster is therefore at an obtuse angle
In most cases the uni-directional rear LED lens will splash the surrounding environment with residual light (walls, road, other cars etc). But I wouldn't trust that... "on a long enough timeline, everyone's chances are reduced to zero".
With a standard filament style lens the light is omni-directional and dispersed from the source, so this issue is vastly reduced.
Get my point?
No matter where you go, there you are.