In the line "We are tailors of the light," the poet suggests that he and other members of his profession create something beautiful or illuminating, akin to how tailors craft garments. This metaphor implies that their work is deeply creative and inspired. Therefore, the best interpretation among the options provided would be:
They create their products out of inspiration.
This choice reflects the idea that their creations are driven by a source of creativity and imagination, rather than simply labor or effort alone.