The speaker completes the description of this everyday love with two images of light: "by sun and candle-light." Basically, this is just a way of saying "in the day and at night," but it also reminds us that the lovers are looking at each other all the time – and that the speaker here loves her beloved no matter what light she sees him in.
If you're counting, this everyday love is the second of the "ways" of loving that the speaker lists.