Transcription factor that binds DNA to G box 5'-CACGTG-3' and to E-box 5'-CANNTG-3' (By similarity). Binds to chromatin DNA of the FT gene and promotes its expression, and thus triggers flowering in response to blue light (PubMed:24130508). Homodimer (Probable). Binds reversibly to CRY2 after blue light illumination (PubMed:24130508). Expressed constitutively in roots, leaves, stems, and flowers.