What is the recommended ANSI Lumen output of a DLP projector for 3D printing?

DLP projector fabricators measure the optical output in different ways and this value is not to be taken as an exact figure. In general terms, the higher the Lumen output of the projector, the faster it will cure the resin. Common values range from 2000 to 3500 ANSI Lumen. This is related to the wattage of your UHP light bulb but will also be influenced by the quality of your filters and optics, as well as if your setup uses mirrors or light-guides to redirect the projected image.