I have two Cygolites for the rear. One on each side of the rear fork. At night I turn it to slow flash which is plenty bright. For daytime I have them on day- lightning medium flash. Never use that mode at night. Way too much light. Could blind drivers. You can easily see these tail lights a 1/4 mile away or more on the sunniest days. Very bright light! The only color is red with several different modes and speeds which you can control. Have used these for two years and love em. They stay charged a long time on flash mode. Maybe 6 or 7, 3 hr rides. Just a great light. Probably the brightest tail lights on the market. I also have 2 Cygolites up front. I use 1 on slow flash mode during days. These are well made waterproof lights, made in the US. Well worth the money.I am curious to know what this Cygolite "DayLightning Flash" looks like. Are they flashing a 'normal' non-colored LED, or does the emanating light still appear red, or what? YT videos make it hard to tell; they point the light at the camera instead of showing the light reflecting off a white wall or something.