During daylight hours brighter is better. my intent is not to spread the light on the road. It is to be seen by cars from a distance. I need that distance because people have other things to do than drive while they are moving down the road in there motor vehicles. Laws against illegal cell phone usage have little effect on people who habitually text while driving. Being seen by traffic approaching from the rear is my main concern. Bright lights with quick movements are better at getting the attention of approaching motorists than florescent clothing. My tail flasher is bright enough that people can still see it during that annoying time twice a day when the sun is low and in your eyes.