I want to know too. LED ligths respond a little quicker, but the driver of the car behind you is by far the slowest/weakest link in the chain.
So if they're the weakest link, shouldn't you do all you can to help them out?
Drivers respond at least 200ms faster to an LED light then an incandescent. At 100km/h that's a difference of 5 metres or a difference in impact speed of roughly 25km/h. That's the difference between no accident and a write off or it could well mean the difference between walking away or not. Frankly I don't see why such a cheap and established technology isn't part of the NCAP testing process, it's far more useful than a seat belt reminder.
It's already impossible to buy truck/ trailer lights that aren't LED, so why are cars still rolling out of factories without?
LEDs that I use are brighter than stock, and so in a sunny country you can actually see them light up, vs incandescent where you have to be staring at the housing and wondering 'is he braking'. This is especially true of lights like the 500 where there's no body work to shade the lights from direct sunlight. News flash to the engineers - the sun is bright.
ECE lighting regs are a joke, look at how hard it is to see the front direction indicators on a lot of cars these days.
I'd rather avoid an accident than be involved in one just for the sake of technical compliance. I don't buy the whole 'different light pattern' -in the case of stop or turn signals- (just buy LEDs with multiple elements that give good light spread) argument when you look at how rudimentary ECE/DOT approved lights can be. My Jeep lights are just a square plastic box with a flat tinplate reflector. How many thousands of CAD/CFD hours went into those? LOL My Renault 3rd brake light is just a diffuser, no reflector at all.
I agree with not messing with headlights, but the tails/stops aren't rocket science. DRL's are sort of a grey area as although you're required to have them fitted, you're not required to have them on. So what's the practical difference between a DRL that's off and a DRL that's not compliant?