The concept of efficiency is relatively complex compared to the two concepts of power and lifetime of LEDs. First of all, there are three general efficiencies, plus five concepts that are usually confused (see Table 1 for details). In addition, there are six concepts of light conversion efficiency produced by the structure, which can be divided into five categories. In the table, we give four of them:
First of all, for a single lamp bead, there are two concepts of efficiency: 1. The luminous efficiency of the lamp bead, that is, how much light can be emitted for each input of 1W of electric energy. This efficiency is an indicator for measuring the luminous efficiency of a single lamp bead, not Measuring the luminous efficiency of the whole lamp, so the luminous efficiency of the single lamp bead is only the basis for determining the luminous efficiency of the whole lamp, and is not equal to the luminous efficiency of the whole lamp; 2. The conversion efficiency of the lamp bead refers to the electric energy per input of 1W, and how much electric energy there is. Used to illuminate. Luminous efficiency is generally used more often, and conversion efficiency is usually used to evaluate the development level of the chip.
Secondly, the efficiency of the lamp bead in the application environment is generally not used, but it is generally used to evaluate the quality of a batch of lamp beads, that is, the power and lamp consumed by the lamp bead directly on the lamp board without considering the drive. The ratio of the total amount of plate illumination. The lumen wattage thus calculated can reflect the average luminous efficiency of a batch of lamp beads, thereby determining the mass of a batch of beads.
In addition, the efficiency of the drive may be more familiar, that is , the ratio of the power of the input drive to the power of the drive output is the conversion efficiency of the drive.
The last one is the focus of everyone's concern, that is, the luminous efficiency of the whole lamp. This formula is very simple, which is the ratio of the total amount of illumination of the luminaire to the total input power. For the light conversion efficiency generated by the luminaire structure, the light conversion rate of the luminaire structure = the total amount of light emitted by the whole lamp / the total amount of light emitted by the lamp board is defined as: the light emitted on the lamp board and the last The ratio of the light emitted by the entire lamp, at least one of which is due to the attenuation of light by the diffuser or the light-transmissive plate.
In common propaganda, it is often confused with the luminous efficiency of the whole lamp and the luminous efficiency of a single lamp bead. For the relationship between them, we can roughly think: the luminous efficiency of the whole lamp = the luminous efficiency of the lamp bead in the application environment - the conversion efficiency of the driving - the light conversion efficiency of the structure.
In this relationship, we can see that the luminous efficiency of the whole lamp should be less than the luminous efficiency of the lamp bead. In addition to the influence of the driving conversion efficiency mentioned above, there is also a problem that is often overlooked by everyone, that is, the lamp The impact of the structure. The influence of the structure of the luminaire is not only the influence of the diffuser plate, especially for the illuminating type of the illuminating type, the light conversion efficiency is very low, which can be said to be a bottleneck restricting the side illuminating type luminaire. Therefore, if we say the luminous efficiency of the whole lamp, the conversion efficiency of the drive and the conversion efficiency of the lamp structure should be deducted.
Efficiency is a more complex concept in LED lighting. At the same time, we must also point out that efficiency is not static, but changes with the working environment. For example, the temperature of work will change the efficiency. So when we talk about LED efficiency, we must not only clearly indicate which efficiency is, but also what efficiency is in the environment.
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