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 (PubMed:26320415). 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 LIL3.1 (PubMed:26320415). Associates with subcomplexes of LHC antenna of photosystem II. Expressed in photosynthetically active tissues (at protein level). Down-regulated 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. Truncated N-terminus.