Strobe lights have many types of use in our modern world. They can be used to increase light and visibility for outdoor work. This might include anything from the construction site for filming movies. Other use of more general and recognizable is at the bar and nightclub and of course we all see it while stuck in traffic at night due to road repairs.
Manufacturers and suppliers produce and distribute different varieties of strobe lights; they come from the smallest which are very portable and the larger ones which can be attached permanently to a certain area. The smaller ones are commonly used by individuals in their cars and homes while the larger ones are used by companies and the government as well.
Then of course there are types used by emergency vehicles and police cars. The type of lights installed on the roof is designed to make emergency vehicles very visible so we can see them even if they are behind us because high intensity flash will even attract our attention in the rearview mirror even if we don't see direct them.
They actually produce flashes similar to those used in the photography industry and usually xenon flash lights. These lights produce very bright flashes for a very short time. It is achieved by turning on the Xenon gas inside the lights, which produce bright light and when this is done repeatedly in a short time we get the familiar strobe strobe of the police.