None of the products mentioned so far are actually strobes. Strobe has a specific meaning, and most LEDs are not strobes unless they're on for only a thousandth of a second or so. Strobes put out a hell of a lot of light, like hundreds to thousands of lumens, for a tiny, tiny fraction of a second. Photographic flashes are strobes.

This is a strobe:
http://www.lightmanstrobes.com/lightman-xenon-strobes