Subject: At what frequency do large stars emit their light?

Given that there appears to be a limit to stars which emit their light 
in the visual range, of around 100 solar masses, if theoretically, one 
were to consider stars of increasing size, at what point (if indeed at 
all) would the vast majority of their light be emited in the invisible
spectrum, i.e. u.v. Xray and gamma ray? 

Re: At what frequency do large stars emit their light?