EXPOSING SCREEN WITH UV LED FLOODLIGHT??

Hi guys- looking to expose some screens at home and oiut of convinience, affordability and safety i'm going for an LED UV floodlight as i've heard good things about their reliability,efficiency and exposure time.

Would a 20 Watt UV LED floodlight be sufficient to expose a dual cure emulsion? and if so how long roughly would you recomend to expose it for and at Watt (pun intended) distance from the screen would you guys suggest placing the light?

all help and answers appreciated

:)