Transcription factor that binds specifically to a 5'-AA[AG]G-3' consensus core sequence. Acts as a negative regulator in the phytochrome-mediated light responses. Controls phyB-mediated end-of-day response and the phyA-mediated anthocyanin accumulation. Not involved in direct flowering time regulation. By red or far-red light. Circadian-regulation. The transcript level rises progressively from dawn and decreases during the night.