LEP.

The print engine in every HP Indigo press: liquid ElectroInk developed onto an imaging plate one color at a time, then transferred to the substrate by a heated blanket, rather than fired through nozzles or fused from dry toner powder. Cost follows sheets and clicks rather than ink volume, and the consumables include a blanket that wears out. That is why an Indigo quote and an inkjet quote for the same book job do not compare line by line.