Guāngxiàn zhàoshè xià, zhùzi de shèyǐng luò zài dìmiàn shàng.
Under the light, the column's shadow fell on the ground.
Tips
usage
In mathematics, 射影 refers specifically to projection in projective geometry (射影几何). In everyday usage it can also describe the shadow or projection cast by an object. The everyday word for 'shadow' is 影子 (yǐngzi).