To examine the possibility of using an inorganic electro-luminescence sheet as a cultivation light source, we conducted cultivation experiments of Spirulina platensis and measured its illumination intensity profile. We found that the illumination intensity profile on the inorganic electro-luminescence sheet was uniform, and that in the horizontal direction it obeys the Lambert-Beer equation. We also found it possible to use the inorganic electro-luminescence sheet to cultivate Spirulina platensis.