On the glass of the lamp manufacturer's instructions etc. specified, when making the lamps to be projected on the wall! We wanted to use it in two sconces and a chandelier, which is why has not been possible because of the light of the lamp, because where the font is printed, was dark thrown against the wall! For me a defective production! If you want to use the lamp in a closed light (z. B. with screen), it could go if necessary. But if they are to be actually used as candles in a chandelier etc., better stay away!