Luminous flux refers to the total amount of visible light emitted by a light source per second. It is essentially the measure of how much light is produced. The unit for luminous flux is lumens (lm). Illuminance, on the other hand, measures the amount of light that falls on a surface. It is calculated by dividing the luminous flux by the area it covers. The unit for illuminance is lux (lx), and it can be further divided into horizontal and vertical illuminance. Horizontal illuminance refers to the light falling on a horizontal surface, while vertical illuminance is the light hitting a vertical plane. The formula for illuminance is: Illuminance [lx] = Luminous Flux [lm] / Area [m²]. This can also be expressed as: Illuminance = Light Intensity [cd] / (Distance [m])². Brightness, denoted by the symbol L, is measured in candelas per square meter (cd/m²). It describes the luminous intensity of a light source in a specific direction, per unit solid angle and per unit area. Color rendering refers to how accurately a light source shows the colors of objects compared to natural light. A higher color rendering index (CRI) means the colors appear more true to life, while a lower CRI results in distorted or less accurate color perception. The CIE (International Commission on Illumination) assigns a CRI of 100 to sunlight, which serves as the reference standard. The color rendering index indicates how well a light source renders colors compared to natural daylight, giving a more complete understanding of its color characteristics. Color temperature is measured in Kelvin (K) and represents the hue of the light emitted by a source. It is based on the concept of a black body radiator, which changes color from deep red to white and then to blue as temperature increases. When a light source matches the color of a black body at a certain temperature, that temperature is referred to as the color temperature of the light. Light efficacy, measured in lumens per watt (lm/W), reflects how efficiently a light source converts electrical energy into visible light. It is calculated by dividing the luminous flux by the power consumed. This is a key indicator of a light source’s energy efficiency. Luminaire efficiency, also known as the light output ratio, measures how effectively a luminaire (light fixture) distributes the light from its installed source. It is determined by dividing the luminous flux emitted by the luminaire by the luminous flux produced by the light source itself. The average life of a light source is the number of hours it operates before its light output drops to 50%. Economic life considers both the degradation of the light source and the reduction in beam output, typically defined as when the output reaches 70% for outdoor lights and 80% for indoor lighting like fluorescent lamps. Glare occurs when there is an object with extremely high brightness or strong contrast within the field of view, causing visual discomfort. It can be categorized into disability glare, which impairs vision, and discomfort glare, which causes irritation but does not necessarily impair vision. Glare is a critical factor affecting overall lighting quality. Solar Light With Camera,Led Solar Light With Camera,Solar Powered Led Light With Cctv Camera,Solar Street Light With Camera 4G Yantai LUHAO Lighting CO.,Ltd , https://www.luhaosolar.com