U.V Strobe?? - never used / seen one so I can't comment, most strobes have a large precentage of UV - hence why white objects pick up clearly with each flash

, however a 100% UV Strobe??, no idea, although I would think that standard Strobe policies and safety information would apply.
With regard UV canons, there was a big outcry over these 5 years or so ago, however the wavelength of the UV used is no more dangerous than that used in stage applications and at theme parks. Alton Towers uses several 1000W types on various sideshows so I wouldn't expect them to be using them if there were any health scares related to them. UV comes in different "wavelengths", the ones used in entertainment are the lowest end of the spectrum. They won't give you a Tan or Skin Damage through exposure.
It depends on what application you intend to use strobes in. However other than the poster it seems that on the original strobe thread that 100% of D.J's were against using them, myself included. - a little overwhelming to be anything other than GOOD advice

. Don't forget that most of these D.J's have been in business for 10 or 20 years and do have a little knowledge on the subject. Usually opinion on this forum can be mixed, however a 100% against is a very strong opinion indeed. Remember being a D.J is about what the AUDIENCE want and what will work well with them, and not what the DJ wants.
Ever seen somebody collapse and suffer an epileptic fit??, No?, well its extremely frightening, not only for the victim but for those around them, and should anybody suffer one at your gig, then I would say that the atmosphere would be ruined and the night pretty much over. Although epileptics tend to avoid clubs by their own choice, they do attend all manner of mobile functions and whilst most standard lighting effects will not usually trigger a fit, strobes always WILL.