A light source apparatus for vehicle lamps and particularly vehicle headlights can include a plurality of LED elements can be mounted in a cavity located on a base surface or on a base. The first part includes a handle and a shank extending from an end of the handle. The slats in the areas between the central portion of the slats and the ends of the slats are bent at least two times in each of said areas and the stiffness of the slats is higher within an area about the middle of the central portion thereof than at the ends of the central portion. The urine reactants tank contains a plurality of baffles separating the tank into chambers. The method is particularly useful for simultaneously filteringpurifying aqueous hydrofluoric or hydrochloric acid.