Study in Quang Binh on the tomatoes planted in house converted by converting light polyethylene film doped with Eu(III) + Y(III) complex with phenanthroline ligand made in Vietnam was reported in the paper. The study results indicated that the tomato planted in the converting light film-house grew very good, especially noted was the shortened growing time shortened, the anti-pestilent and insect abilities enhanced, quality of the tomato, for example degrees Brix, content of total sugar and vitamin C, increased effectively.