“In order for a daytime running light to be effective, it’s got to be really bright. There are important aspects of the light that make it a daytime running light. Lumens are an important part of the light, but take a 60-watt light bulb, for example. That might output 800 lumens, but if you take that light bulb and go a long ways away, it’s not going to look very bright. In contrast, if you’ve got a laser that’s really focused, it might only output one lumen, but you can see it for miles away.

LEDs have a really wide beam angle, so we use optics to concentrate that beam angle and increase its brightness. Drivers have a lot of distractions going on. If you’ve got a steady light, it blends in with the surroundings. But if you’ve got a flashing light, it sticks out and really catches people’s attention. We’ve discovered that our flash pattern is a lot more noticeable.

Drivers need time and space to react. So we’ve determined that they really need 400 meters of visible distance in order to have that time.

To classify a light as a daytime running light, it needs focused optics, an interruptive flash pattern, and a visible distance of at least 400 meters during the day. We’ve got a range of daytime visible tailights: our Flare R is visible from over 2km away, and we also have a range of daytime visible headlights. Our Ion 800 R is visible from over 1.5 km away.

A is the most important part of the ABCs. Research has shown us that lights that are always on is the most effective way to increase your visibility during both the day and night.”

Author: ‘Trek Bicycles’