BUT I do not know how to compare to Camera Flash 58m./ 190' @ ISO = 100----Yes? How many of 580 EX to be equal 500 Wats Power of Phottix Indra 500TTL ?
The easiest way to compare lights would use the guide numbers you get when using the strobe with a specific reflector. For example Profotos Magnum reflector paired with the 500Ws B1 gives you a guide number of 45@2m(studio lights are often rated at 2m or 6 ft, its more representative of real world useage - and the inverse square law doesn't work at such small distances when you use anything but a bare flash as it assumes a point source), or 90m. Which doesn't sound like much of a gain, thats because the reflector covers a wider area, but gives you a comparison for a set distance. (The narrow beam would have a gn of 90@2m or 180m, but I'm not aware of such a reflector for the Bowens mount while one of the Bowens tele-reflectors should perform in about the same ballpark as the Magnum).
That changes when you use some sort of additional light shaping, the guide numbers become meaningless and only the energy counts. If you'd take a speedlight apart and look at the parts used you can calculate that they store somewhere from 40-80Ws, depending on the model. Add the longer recycle times and tendency to overheat and you have an idea how many flashguns you'd need in that case.