When we talking about the lighting products we will usually use some proper name to describe them. If you still feeling confusing about the mass concept here we make a list to help your easy understanding
Beam (luminous flux)
The sum of the light source emitted every second, or we can understand it’s the measure of light
The intensity of light, the amount emitted in a particular direction angle
The amount of incident light per unit area, is used to indicate the brightness of a place.
When the color of the light emitted by the light source is the same as the color of the black body radiated at a certain temperature, the temperature of the black body becomes the color temperature of the light source. The higher the temperature of the black body, the more blue components in the spectrum, and the fewer the red components. For example, the color of the incandescent lamp is warm white, the color temperature is 2700K, and the color temperature of the daylight fluorescent lamp is 6000K
And there are more you may interesting as below:
In general, artificial light should be the same as natural light, and the naked eye can correctly distinguish the color of things. The degree to which the light source appears to the color of the object becomes color rendering, usually called the color rendering index Ra.
Luminaire efficiency (also called light output factor) is an important criterion for measuring the energy efficiency of a luminaire. It is the ratio between the luminous flux output from the luminaire and the luminous flux output from the luminaire.
Light source efficiency
The amount of electricity generated per watt, the higher the value indicates the higher the efficiency of the light source, so it is usually an important consideration for places that are used for a long time, such as office corridors, roads, tunnels, etc.
The number of light reflected by the unit projection surface of a light source in a certain unit in a unit solid angle is called the brightness of the light source in a certain direction. The symbol is L, the unit is cd/m2 (candela per square meter)
Objects with extremely high brightness or strong contrast in the field of view can cause visual discomfort called glare. Glare is an important factor affecting the quality of lighting
The ratio of the useful power to the apparent power (the product of voltage and current) in the circuit
Average life span
Rated life, which is the life of 50% lamp when it fails.
Beam angle refers to the angle between the 1/10 maximum light intensity of a lamp.