A litmus test in chemistry is used to determine acidity; a lit-mesh test in lighting is used to determine light play factor. Really (even if Google disagrees). Lit-Mesh Test creates some amazing light patterns through its recycled stamped steel rectangles.
6" Width x 26.25" Height
Incandescent: 3 x 40 Watt 110V Candelabra Incandescent bulbs (not included)