Strobes typically utilize a xenon gas filled flash tube instead of a filament light bulb that most people are familiar with. The electronic circuit design of a strobe allows it to store the incoming operating voltage until it reaches a sufficient level and is triggered internally to arc across the points within the strobe tube lamp thus emitting a flash of light. This flash usually occurs with the majority of strobes from 60 to 85 or so flashes per minute while the strobe is powered. The various strobes available today can be differentiated primarily by flash intensity (brightness), housing or enclosure suitability for different environmental atmospheres, i.e. indoor, or outdoor, or hose down resistance (ingress protection), electrical rating/Agency Listing for atmospheres that may contain explosive gases, dust, etc.,and mounting configurations suited to the application. There are other factors that make each differ from the other and all this results in a large selection, and all of the above generally contributes to the wide range of pricing.