If you need a more attention-getting be-seen light for nighttime, you can get one of those little button-cell squeezy flashlights and set that on blink, then use both lights together. It's easier to identify a white light as a cyclist if the light is flashing. Otherwise it can look like a porch light or whatever. But steady light is supposed to be easier to judge distance on, so it seems like a good idea to have both.