Installing these in my passenger cars made great looking models look even better! Installation is a finnicky process, but it's easy once you understand where everything needs to be. Make sure the reflector butts up against the LED (at least get it as close as possible) so the light is evenly distributed along the car. While there is occasional flickering, there are a few things you can do to keep it to a minimum. Keep your rails and wheels clean, and I recommend wrapping a small strip of electrical tape around the base of the light housing (where the LED clips in) to keep the light in constant contact. Even though installing these lights can be troublesome, the result makes the effort more than worth it.