| lumen |
the hollow area within a tube.
출처: www.health.uab.edu/show.asp
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| lumbar puncture |
a special needle is placed into the lower back, into the spinal canal. This is the area around the spinal cord. The pressure in the spinal canal and brain can then be measured. A small amount of cerebral spinal fluid (CSF) can be removed and sent for testing to determine if there is an infection or other problems. CSF is the fluid that bathes the brain and spinal cord.
출처: www.health.uab.edu/show.asp
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| luminance |
A measure of the intrinsic luminous intensity emitted by a source in a given direction. Luminance is a measure only of light. The comparable term for electromagnetic radiation in general is radiance.
출처: www.novalynx.com/glossary-l.html
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| luminous flux |
The flux of visible radiation, so weighted as to account for the manner in which the response of the human eye varies with the wavelength of radiation. The basic unit for luminous flux is the lumen.
출처: www.novalynx.com/glossary-l.html
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| luminous intensity |
The intensity (flux per unit solid angle) of visible radiation weighted to take into account the variable response of the human eye as a function of the wavelength of light. Usually expressed in candles.
출처: www.novalynx.com/glossary-l.html
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