2021 Drake Smith - Please do not use or reproduce this elsewhere.  Feel free to link to it though.

Awesome $6 Tail Light Upgrade

(with "Eagle Eye" LEDs)



The stock tail and brake lights on K bikes are rather anemic. Over the years I've done numerous LED upgrades and this is my latest and greatest.  Since it's just add-on lighting nothing special has to be done to accommodate the LEDs.

This DIY project takes some wiring and drilling but on the whole it's fairly simple and the end results are well worth it if you're up to the task.

The upper center LED comes on with the parking tail light. When a brake is applied the two lower LEDs strobe alternately with the center light and then go solid.

Parts Required:

"Eagle Eye" LEDs: These only cost $0.99 each on eBay. The video above doesn't do them justice but trust me in real life they are incredibly bright and noticeable, even in bright sunlight. (They come in several colors so be sure to buy red ones for this project.)

(For some reason the Eagle Eye LEDs are sold as 9 watts each but in reality they only pull about 1/2 watt each so the power load of them is very negligible.)

GS-100A Strobe Controller: This can be found on eBay for about $2.  The controller flashes the LEDs a few times when the brake light first goes on and then remains solid as long as the brake light stays on.

You'll also need a way to tap into the existing brake and tail light wiring.  Piggyback connectors work well for this.

Wiring Schematics:

OPTION 1: Center light remains solid.

OPTION 2: Center light "wags" (alternates) with brake light. (As shown above.) This is a little more complex but is more visible when the brakes strobe. For this you need to add micro relay as shown at this at this link.


Notes on implementation:

The Eagle Eye LEDs have very skinny gauge wiring so what I do is solder heavier, longer wires close to each one of them and then protect it with heat shrink tubing.

The Eagle Eye LEDs have a 10mm diameter so you'll need to enlarge the center hole and fender extender mounting holes to 10mm.



2021 Drake Smith - Please do not use or reproduce this elsewhere.  Feel free to link to it though.