What is this "triangle light" you speak of?
We referred to it as "the triangle effect". Several studies have been done that proved that a certain configuration of lights on the front of a motorcycle increased it's visibility/speed/distance to motorists:
from this article:
"Many years ago the railroad industry determined that the most conspicuous lighting arrangement, and safest, was to have a triangle of forward facing lights, the largest, brightest light at the top and two slightly smaller/dimmer lights mounted horizontally below it. This configuration had benefits that might not be immediately obvious. Most notably, when a train is moving toward you the two bottom lights appear to get farther apart. Thus, you not only recognize the lights as coming from a train, but you can tell if it is moving toward you, and you can even estimate at what speed.
A motorcycle can have exactly the same lighting advantage. If you mount running lights below your headlight you have created that magic triangle. When seen from the front you no longer look like a far distant car. Since nobody expects to see a train coming toward them on a public road, you are recognized for being 'something else' - indeed, almost certainly a motorcycle."
A single headlight, or two closely stacked headlights can't have the same effect as the triangle. I use the triangle and SMIDSY all the time and very seldom use my horn. If you are blowing a horn to warn a driver, you got too close to the threat to start with.
PS: in this day and age maybe we need to come up with more "attention getters" on the rear of the bike...maybe a RED Triangle back there.....the times, they are a changin.