16 Pcs 47.24″(Total 63 Ft) Ceiling Crown Molding with LED Duct Kit for Seamless Ambient Accent Lighting Waterproof Channel for Easy LED Trim Moulding Strip Installation. Polystyrene Crown Moulding: quality LED crown moulding with integrated light channels; Lightweight, sturdy, and easy to install; Its versatile design is suitable for adding soft ambient lighting and a modern aesthetic to any room.