Illuminance meter lingo and definitions that are common
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". 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 (like the unit of length, the Chinese name is "meter", and its symbol is "m", adding an "m" in front of it becomes "mm", and 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 bacteria and viruses
