Disclosed herein is an improved closed algae grower. The improved closed algae grower has a container, an upper lid and at least one light-emitting device. The container defines a volume for accommodating a liquid culture medium for cultivating algae. The upper lid is used to cover the upper opening and is substantially light-impermissible. The light-emitting device is coupled to the upper lid and extends from the upper lid substantially in the longitudinal direction such that at least a portion of the light light-emitting device is configured to be submerged in the liquid culture medium.本揭示內容的藻類養殖桶具有一槽體、一上蓋以及至少一發光裝置。所述槽體形成一容置空間,可供注入用以培養藻類的液體培養基。所述上蓋為不透光材質以隔絕外部光源,其係用以覆蓋槽體之上開口,以形成一密閉式槽體結構。所述發光裝置的一端耦接至上蓋且沿著縱長方向向槽體下方延伸設置,藉使每一發光裝置的至少一部分可浸置於槽體內液體培養基的液面下方。100‧‧‧密閉式藻類養殖桶110‧‧‧槽體112‧‧‧側壁114‧‧‧底部116‧‧‧上開口118‧‧‧藻類入口端120‧‧‧成熟度監控器126‧‧‧收集出口端128‧‧‧氣體排出口130‧‧‧上蓋140‧‧‧發光裝置150‧‧‧密封件160‧‧‧氣體引導管162‧‧‧氣體感測器170‧‧‧溫度感測器180‧‧‧收集管182‧‧‧收集控制單元
