Question: when does phoebe find out leo is a whitelighter

title: Leo Wyatt
text: When Leo returned , Phoebe discovered him levitating to change a light bulb and he confessed the truth to her . He also told her that as much as he loved Piper , he did not think their relationship could continue ; witches and Whitelighters are not meant to be together . He was later shot by a Darklighter 's poison arrow while attempting to protect one of his charges . He went to the manor for aid , where Prue and Piper learned he was a Whitelighter . Piper used a spell to switch powers with Leo , so she could heal him . Piper then confessed she still loved him , but unfortunately Leo is still unconscious due to the poisoned arrow . Leo 's `` trigger '' to make the healing power work was love , and because of Pipers confession , he was healed . Leo offered to give up being a Whitelighter to be with Piper , but she did not want him to turn away from his calling . 

Answer: answer: When Leo returned, Phoebe discovered him levitating to change a light bulb and he confessed the truth to her that he was a Whitelighter.