Originally Posted by Dochatley
All of us who can't be there want to see it now.........Is it bright?
It's nothing fancy, but I believe effective. I wired the trunk rack LED to be a 1/2-power running light, making the tail *much* more noticable at night, and installed a Kisan flasher unit to provide a decaying-flash-speed brake light function *only* at the rack light.
I believe this is a better approach than making *all* the brake lights flash, based on two fundamental human reactions.
First, the human brain is attracted to contrast -- primarily contrast in color, contrast in motion, and constrast in intensity. Providing contrast is key to getting cager attention.
Second, most cage drivers have been trained through years of vehicle operation to subconsciously process and respond to a *solid* red brake light.
My belief is that a flashing brake light is an excellent way to *get* a cager's attention, but that the cager doesn't instantaneously, subconsciously process it as a "brake!" stimulus, like they would if they saw a solid brake light. Of course, if there's no blinking, they may not immediately see the brake light at all (as can happen when they look away, and then look back after the brake light has been illuminated, and therefore miss the "change" from off to on).
So, I prefer both -- a flashing rack light to get attention, and a solid main brake light to trigger the "stop!!" reaction. The Kisan unit continues to flash to get attention even from those that miss the initial brake application (the flashing continues for several seconds), but eventually goes solid to prevent cager annoyance at stop lights.
The difference may be only a few milliseconds, but hey, that's a few milliseconds in my favor.
Lastly, I don't believe turn signal LEDs at the trunk level add much, or are all that effective. The main turn signals are very good, being large and bright yellow (i.e., high contrast, both in color and intensity). Very hard to miss, especially at night. In contrast, while you may think you see a big difference from a trunk-mounted LED turn signal when you're standing right next to it, as a practical matter at 100 feet behind, it's not all that noticable relative to the large, bright yellow turn signal.
Moreover, I suspect that a trunk-mounted LED actually slows cager reactions. Rather than the cager seeing and immediately reacting to the subconsciously-recognized "standard" yellow turn signal, they see some additional flashing light *nearly at the center of the bike* -- not a normal turn signal location. This additional, not instantaneously-recognized "thing" requires additional processing for the brain to "recognize" and process as a turn signal -- a distraction that may affect reaction time. Of course, I could be wrong about this, but that's the reason I didn't add a trunk LED turn signal.