Light-harvesting-like protein required for biosynthesis of phytylated chlorophylls and alpha-tocopherol in green seedlings. Functions by anchoring geranylgeranyl reductase (GGR) in the thylakoid membrane, leading to the stabilization of GGR activity (PubMed:20823244, PubMed:24275650). Binds chlrophyll a in the thylakoid membrane (By similarity). Plays a role in the regulation of chlorophyll biosynthesis under light stress and under standard growth conditions (PubMed:25808681). Interacts with GGR (PubMed:20823244, PubMed:24275650). Forms homodimer, and heterodimer with LIL3.2 (PubMed:26320415). Associates with subcomplexes of LHC antenna of photosystem II. Expressed in photosynthetically active tissues (at protein level). Induced by light. No visible phenotype under normal growth conditions, but the double mutant plants lli3:1 and lli3:2 are dwarf with yellowish green leaves.