i run a planet bike superflash on the front day (flash during the day and would run steady if I rode at night.) sometimes when cloudy I have a little silicone 1 led light i run on solid so people can just my speed.

I have a 7 LED light on the back. I forgot the name. 5 red and two yellow (side firing) I run it during the day. . I also have a light 3 led on solid in the rear of my pannier on the mornings when it is especially cloudy or foggy.

I am thinking about putting my superflash on the rear of my bike too. since it is bright and noticeable.