This is the standard unit of measure of illuminance, or how much light is hitting a given surface. Since we know that one lux is equal to one lumen per square meter, we can calculate how much light (lumens) is needed to illuminate a given space.
Think of lux as watering a lawn with a hose versus a sprinkler. Just running water (max lumens) out of the hose gets just a small area very wet. Using a sprinkler spreads the water out over a larger area, giving equal amounts of water (lux) to the lawn.
Machine lamp Sometimes used as a general term for workplace luminaires, machine lamps are luminaires that are permanently fixed to a piece of equipment. Instrument cabins, for example, may have machine lamps that are fixed to the inside of the cabin to make servicing the instrumentation easier.