One volt higher will not make a difference:
https://www.amazon.com/TS-18WL29V-Transformer-Raintight-Seasonal-Use-Christmas/dp/B09M9B9JZP/ref=mp_s_a_1_2?crid=JAEQ5003JQNY&keywords=TS-18WL28V&qid=1673112796&sprefix=ts-18wl28v%2Caps%2C513&sr=8-2