Common terms and explanations of illuminance meters
Definitions of mcd, lumen watts, and illuminance
Lumen watt": The energy emitted by the light source per unit time to the space that makes people feel light is called "luminous flux", and its unit is "lumen". "Lumen watt" is the reading method of "lumen/watt", which refers to the light emitted by the light source The ratio of the luminous flux to the electrical power it consumes is the luminous efficiency of the light source.
"mcd": The spatial density of luminous flux, that is, the luminous flux per unit solid angle, is called luminous intensity, which is the amount to measure the luminous intensity of a light source. Its Chinese name is "candela" and its symbol is "cd". The "m" in front is the prefix, which means one thousandth (just like the unit of length, the Chinese name is "meter", and its symbol is "m", if you add an "m" in front to become "mm", it becomes One-thousandth of a meter, that is, millimeters), so the Chinese pronunciation of "mcd" is "millicandela".
"Illuminance": refers to the luminous flux per unit area of an object illuminated by a light source. In layman's terms, it is the degree to which an object is illuminated. The unit is "lux", and its symbol is "Lx
Long-wave ultraviolet (UVA): wavelength 400-320nm, its biological effect is weak, it has obvious pigmentation effect, and the effect of causing erythema reaction is very weak, which can cause some substances (fluorescein sodium, tetracycline, quinine sulfate, hematoporphyrin) , pyocyanin of Pseudomonas aeruginosa and substances produced by some molds, etc.) produce fluorescent reactions. It can also cause phototoxic reactions and photoallergic reactions. Medium wave ultraviolet (UVB): wavelength 320 ~ 275nm, is the most active part of ultraviolet biological effects. The erythema reaction has a strong effect, which can convert provitamin D into vitamin D, promote epithelial cell growth and melanin production, and inhibit allergic reactions. Short-wave ultraviolet (UVC): wavelength 275-180nm, the effect of erythema reaction is obvious, and it has obvious killing and inhibiting effect on viruses
