UV Lights

I´d also like to know can I use those UV-lamps sold on local aquariumshops.

What type of wavelength I should look after since my main goal is to
make cyanos.

Should it be more UV-B or UV-A? It has been too long since my fysics
classes to remember those details

Also bulb or fluorecent? Single or bunch of them?

-- 
Timo Sund
Palaios Photos
Finland
http://palaios.com
...to cyano or not to cyano...