Conversion relationship between the brightness of the illuminance meter and the unit of illuminance
(1) When a light source shines on an object, we can determine which is emitted by the light source (Lumvnce? D brightness) or which is reflected by the object (Illuminance? D illuminance).
(2) The illuminance depends on the reflection characteristics of the object. It is very similar to a photograph, as it only measures reflected light. Its common unit is lux.
(3) However, an EL lamp is a light source: it should be expressed in units of brightness, namely fL (foot Lambertian) or cd/m2, also known as "nits". Some engineers prefer to use fL, while international standards organizations commonly use nits. The formula for converting nits to fL is: 1nits × 0.2919=1fL; And 1fL × 3.426=1 nits [Note; these factors are derived from pi (π) and m2/ft2 (0.0929)].
(4) It is obvious that using lux is an incorrect unit and cannot be converted from lux to other units. 1 Lux = 1 lumenpersquaremeter= 0.0929 footcandle 1 footcandle= 1lumen persquarefoot =10.764 Lux1 foot Lambert= 3.426 candelas per squaremeter (nit) 1nit (candelas per square meter) = 0.2919 footLambert
Luminous flux
Luminous flux: refers to the rate at which a light source emits light energy or the flow rate of light (Flowarte). It is a basic quantity used to describe the ability of a light source to emit light, measured in lumens. For example, a 100 watt (W) light bulb can produce 1750lm, while a 40W cool white fluorescent tube can produce 3150lm of luminous flux. According to the definition, 1lm is the luminous flux emitted by a uniform point light source with a luminous intensity of 1cd within a solid angle of 1 spherical degree.
