Lumen measures the overall light intensity emitted at the source, while candlepower measures the intensity of the brightest part of the beam of light. Thus, it is possible to have a light-source with a high lumen rating, but a low candlepower rating, and vice versa. To get your head around this concept, take the example of a laser source. A laser source emits an extremely focused beam of light (laser). A powerful laser could have a light intensity that is so high that it could burn a hole in the target. However, even the most powerful laser would hardly be of any use in lighting up a dark room. A laser displays these contradictory characteristics, because even though a laser has a high light intensity in one direction, it has very little light intensity in the remaining ones. The narrower the beam of light, the higher its candlepower-to-lumen ratio will be. In other words, a laser has a high candlepower rating, but a low lumen rating.
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