Strobe on high powered lights should only be used during the daytime.. If you are using at night, it is best you use sos mode so as to not confuse drivers.. Strobe from a distance gives off the appearance of emergency vehicles approaching at night. There are a few lights that if they are nothing more than being seen lights have a slower paced flashing mode like the Romisen RC-C8 II R2 Flood-to-Throw LED Flashlight, it uses a variety of cells and can be adjusted from flood to tight beam, a very solid light.

http://www.shiningbeam.com/servlet/t...8-II-R2/Detail