Originally Posted by
seeker333
The main selling point of DS500 was the fact that it seemed capable of delivering adequate output to make one more conspicuous during sunny days. I find that even at 800 lumens it doesn't necessarily attract the attention of motorists distracted by audio, conversation, phone or sleep deprivation. As you know, with virtually infinite output capability you can reduce DS500 to 100 lumens or less for responsible nightime use.
There isn't a tail light bright enough to do what you want. If someone is looking down at their phone, the ONLY way to get their attention is have a light bright enough to illuminate the inside of the car in daylight. That's definitely going to blind everyone.
What you really need is a light capable of being noticed at a distance of ~0.5mi. Being visible farther away than that is almost irrelevant because 99% of the time, you will be obscured behind traffic, corners, elevation and other obstacles.
That means that basically any ~200-300 lumen rear light is equivalent. Beyond that you're just needlessly blinding people.