The first known use of illuminance was circa 1938. In photometry, illuminance is the total luminous flux incident on a surface, per unit area.It is a measure of how much the incident light illuminates the surface, wavelength-weighted by the luminosity function to correlate with human brightness perception. light. See more words from the same year Luminance is a photometric measure of the luminous intensity per unit area of light travelling in a given direction. illumination has definitions from the fields of fine art,physics,religion 1 [ noun ] (religion) a condition of spiritual awareness; divine illumination .
Time Traveler for illuminance. In colloquial usage, the terms model, theory, and law are often used interchangeably or have different interpretations than they do in the sciences. Illumination Models Illumination model 3: Ambient + diffuse + specular light L to light source Normal vector N R u u V o L - light source direction N - Normal vector u angle of incidence V - line of sight R - direction of ideal specular reflection o angle between R and V line of sight If o=0, we have a perfect reflecting surface (a mirror). illumination [formal] | illuminations. Similarly, luminous emittance is the luminous flux per unit area emitted from a surface. In relation to the study of physics, however, each term has its own specific meaning. Definition of Terms: Model, Theory, Law. Illumination for lithography tools can be split into two groups: lamp-based systems and laser-based systems. Luminous emittance is also known as luminous exitance.
The lamp-based systems use a high-pressure mercury arc lamp that is contained within the tool body. Illuminance definition is - illumination. light | "illuminations": [British] coloured decorative lights outside which make a town look bright and exciting at night (17 of 33 words, 2 definitions, 2 usage examples, pronunciation) dictionary .cambridge .org /dictionary /british /illumination Synonyms.