Question about Hoover Ultra Vortex

We vacuum the mattresses with the unit. We didn't think about the UV light. The UV light goes downwards and is supposed to disinfect the mattress against bugs etc. You have to press the corresponding button for this. You have to press the corresponding button, but it would also work without it.

J/m2? I don't understand; the suction works fine; the UV lamp turns on when the nozzle looks down. Thus no possibility to look into the light