This creation is a device for cultivating plant growth through light, which includes a base, at least one light source, at least one light-concentrating sheet, a position adjusting device, and a distance sensor； the top of the plant and the distance sensor are sensed by the distance sensor The height of the plant can be known from the distance, and the position adjustment device can adjust the distance between the light source and the condenser according to the position, and the condenser can adjust the irradiation range of the light source. The exposure range of the light sheet is small, so as to focus on the plants farther away to avoid the waste of light energy on other places； when the plants gradually grow taller, the distance between the light source and the light condensing sheet is changed to make The light radiating from the light-concentrating sheet has a large irradiation range to ensure that the plants can be evenly and adequately irradiated； this creation effectively uses light energy to save energy.本創作係透過光照來栽培植物生長的裝置，其包含一基座、至少一光源、至少一聚光片、一位置調整裝置及一距離感應器；透過距離感應器感應植物頂端與距離感應器的距離而可得知植物的生長高度，並依此使位置調整裝置調整光源及聚光片的距離，而使聚光片來調整光源的照射範圍，藉此當植物生長初期時，會使從聚光片透出的照射範圍較小，以集中照射於較遠處的植物，以避免光能量照射於他處而浪費；而當植物逐漸長高後，則改變光源及聚光片的距離而使從聚光片透出的照射範圍較大，以確保仍可均勻充分的照射到植物上；本創作藉此有效運用光能進而節能。
