Specifications: This ?Light in Shadow Room? is used for the study of the appearance of a shadow in a phosphorus covered paper; in which the paper will illuminate when lightened. Phosphorus will absorb light energy and will slowly release it in a shadow room so that there is a shadow of a person on the screen of dimensions 90x205x200 cm. Inside the shadow room, there is a fan for sucking out air on the ceiling. The entrance door is of size 175x80cm. The room uses neon light 220V.