1, Basic concept of LED brightness
LED brightness generally refers to the luminous intensity, which represents the ability of a light source to emit light in a specific direction, measured in candela (cd). The higher the brightness, the brighter the light source in that direction. However, in the field of lighting, in addition to luminous intensity, luminous flux, illuminance, luminous efficiency, and other important parameters are also used to describe the performance of light sources.
Luminous flux: refers to the amount of light emitted by a light source per unit time, that is, the portion of radiated energy that can be perceived by the human eye. It is equal to the product of the radiation energy of a certain band per unit time and the relative visibility of that band. The unit of luminous flux is lumens (Lm).
Illuminance: Refers to the degree to which an object is illuminated, expressed in terms of the amount of light received per unit area. The illuminance is related to the lighting source, the illuminated surface, and the position of the light source in space. The unit of illumination is lux (Lx), where 1Lx=1Lm/㎡.
Luminous efficiency: refers to the efficiency of converting electrical energy into light energy, measured in lumens per watt (Lm/W).
2, Factors affecting the brightness of LED linear lights
The brightness of LED linear lights is influenced by various factors, including the performance of LED chips, the number of beads, driving current, heat dissipation performance, and optical design.
LED chip performance: The performance of LED chips directly affects their luminous efficiency and brightness. High quality LED chips have high luminous efficiency and brightness.
Number of LED beads: The brightness of a linear LED lamp is directly proportional to the number of LED beads inside it. The more beads there are, the higher the brightness.
Driving current: The brightness of LED is almost proportional to the driving current. Within the rated range, increasing the driving current can significantly improve the brightness of the LED. However, excessive current may cause LED overheating and reduce its service life.
Heat dissipation performance: LEDs generate heat during operation, and poor heat dissipation can cause the LED temperature to rise, thereby affecting its luminous efficiency and brightness. Therefore, good heat dissipation performance is a key factor in ensuring stable brightness of LED linear lights.
Optical design: The optical design of LED linear lights, such as lenses, reflective cups, etc., can also affect their brightness. Reasonable optical design can optimize the distribution of light and improve lighting effects.
3, Method for calculating the brightness of linear LED lights
Calculating the brightness of LED linear lamps requires consideration of multiple factors, including luminous flux, illuminance, and the power and efficiency of the lamps. The following is a calculation method based on luminous flux and illuminance:
Calculate luminous flux:
Luminous flux is the basis for calculating the brightness of linear LED lights. You can obtain the luminous flux value of LED chips or beads by consulting their specifications. If an LED linear lamp is composed of multiple LED beads, the total luminous flux is the sum of the luminous flux of each bead.
Calculate illuminance:
Illumination is a physical quantity that measures the degree to which an object is illuminated. According to the definition of illuminance, illuminance (E)=luminous flux (Φ)/area (A). Among them, the luminous flux (Φ) is the total luminous flux of the LED linear lamp, and the area (A) is the area of the illuminated object. Therefore, the illuminance value can be obtained by measuring the area of the illuminated object and calculating the luminous flux per unit area.
Consider the power and efficiency of the lighting fixtures:
In practical applications, the brightness of LED linear lights is also affected by their power and efficiency. The higher the power of the lighting fixture, the more energy it consumes, but it does not necessarily mean that the brightness is higher. Because the efficiency of lighting fixtures can also affect their brightness. A lamp with higher efficiency can emit more light flux at the same power, thereby improving brightness.
Comprehensive calculation:
Based on comprehensive consideration of factors such as luminous flux, illuminance, lamp power, and efficiency, the brightness of LED linear lamps can be calculated using the following formula:
LED linear lamp brightness=luminous flux x lamp efficiency/illuminated object area
Alternatively, by calculating the illuminance value, the brightness of the LED linear lamp can be indirectly reflected
Illuminance value=total luminous flux of LED linear lamp/illuminated object area
It should be noted that the above calculation methods are only applicable to general situations. In practical applications, factors such as the installation method, usage environment, and lighting requirements of LED linear lights need to be considered to obtain more accurate brightness values.
4, Precautions in practical applications
When calculating the brightness of LED linear lights, the following points should also be noted:
Measurement accuracy: Ensure the accuracy of measuring luminous flux, illuminance, and the area of the illuminated object to obtain accurate brightness values.
Environmental factors: Consider the impact of usage environment on brightness, such as wall color, reflectivity, etc. These factors can affect the propagation and distribution of light, thereby affecting brightness.
Lighting requirements: Select the appropriate LED linear light model and quantity according to the lighting requirements. Different lighting requirements also have different requirements for brightness, so it is necessary to choose according to the actual situation.
Safety: When calculating the brightness of LED linear lights, safety should also be considered. Ensure that the LED linear light does not generate excessive temperature or current during operation to ensure its long-term stable operation.
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