The Shabbat candle blessing is first recorded in the ninth-century prayerbook, Seder Rav Amram. Lighting Shabbat candles as part of the synagogue service is an innovation of Reform Judaism.
בָּרוּךְ אַתָּה יְיָ אֱלֹהֵֽינוּ מֶֽלֶךְ הָעוֹלָם, אֲשֶׁר קִדְּשָֽׁנוּ בְּמִצְוֹתָיו, וְצִוָּֽנוּ לְהַדְלִיק נֵר שֶׁל שַׁבָּת.
BARUCH atah, Adonai Eloheinu, Melech haolam, asher kid’shanu b’mitzvotav, v’tzivanu l’hadlik ner shel Shabbat.
Blessed are You, Adonai our God, Sovereign of the universe, who hallows us with mitzvot, commanding us to kindle the light of Shabbat.