The con genes of Neurospora crassa are preferentially expressed during a developmental process known as conidiation. We present evidence indicating that transcription of con-5 and con-10 is also stimulated by blue light. Transcription of these genes was not photoinducible in wc-1 and wc-2 mutant strains. The response of con-5 and con-10 to blue light was similar to that of al-1 and al-2, genes involved in carotenoid biosynthesis, and bli-3 and bli-4, blue light inducible genes.