Lamp black is a pure carbon pigment, made from soot deposited from burning oils. Lamp house is a light tight housing of an enlarger or projector, which contains the light source.
Lantern slides is an old term used to describe transparencies.
Large format camera is a general term for any camera having a picture format of 4 x 5 inches or larger. Laser is an abbreviation for Light Amplification by Stimulated Emission of Radiation. Latensification is a method of increasing relative film speed by fogging after exposure and before development. It can be achieved by chemical or light means. Latent image is the invisible image produced by exposure which can be made visible by development.