Artograph's prism projector is an opaque projector. it can enlarge or reduce images you find on opaque surfaces like drawings, photos or pages from a book or a magazine. these images are projected on to a wall, work surface or table top so they can be redrawn at a different scale. the prism projector, like the super prism projector, uses two photo quality bulbs to produce 500-watts of white bright lighting. the lens in the prism can be reversed for enlargement or reduction. it can enlarge up to 20-times the size of the original and can reduce to 80-percent of the original. the glass copy area is a generous 7-inch-by-7-inch and is top loading. the removable hinged lid is perfect not only for flat objects like photographs, but for books and small 3-d objects as well. the fan in the back of the projector draws air through a dual cooling channel system. the projector is also protected from overheating through a thermal overload circuit. although the bulbs produce very bright light, a reduc.