A problem I've found with all LED replacement tail/stop bulbs is there is never enough difference between the modes, such that the stop indication does not provide the eye-catching flash that's needed to alert following drivers. The standard filament bulb is 5w for the tail and 21w for the stop, so a big difference in light output. I'd guess that most LEDs are biased to the tail function. Add to that that the LED never makes full use of the parabolic reflector in the original housing which produces a proper beam with a filament.
I'm all for LEDs up front but don't care for them in turn signals, and stick very firmly with Osram long-life filament bulbs at the back, behind a red lens. Not cool perhaps, but safer IMO.
Nick
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