A light-sensitive calcium channel that is required for inositide-mediated Ca(2+) entry in the retina during phospholipase C (PLC)-mediated phototransduction (By similarity). Forms a regulated cation channel when heteromultimerized with trpl. Interacts preferentially with trpl and interacts to a lower extent with trp. Expressed predominantly in the rhabdomeres of photoreceptor cells. Belongs to the transient receptor (TC 1.A.4) family. STrpC subfamily.