Yes it will. But a UVC wand is fairly quick. I have an ozone wand that works particulalry well on smells but to get rid of all the spores I would use the big blaster; which means waiting time.
Actually I have dealt with this in my own bathroom using just the blaster, which eradicated the whole thing , but only after I had exposed the brickwork behind the plaster and stopped the holes up where the damp was coming in.
I couldnt use any chemicals as I try to keep a fume free house , I have a form of asbestosis and dont want coughing spells.
A while ago I found a really useful site concerning Black Mould, and learned a lot from it especially the different varieties. Now I cant find it. Will keep searching.