Explain the four types of LED lighting efficiency concept

Introduction: the relative power and life of LED two concepts, the concept of efficiency is relatively complex. First of all, there are 3 general efficiency, plus the usual confusion of the concept of the 5 (see Table 1), coupled with the light generated by the structure of the light conversion efficiency of a total of 6 concepts, can be divided into a total of five categories. In the table, we give four classes:

First of all, for the single chip, there are two concepts of efficiency: 1, light emitting efficiency, each input 1W power, can how much light, the efficiency is a measure of the single lamp luminous efficiency indicators, and is not a measure of the whole lamp luminous efficiency indicators, so the only single lamp luminous efficiency a decision based whole lamp luminous efficiency, but not equal to the whole lamp luminous efficiency; 2, light conversion efficiency, refers to each input 1W power, how much power can be used to shine. Luminous efficiency is generally used more, conversion efficiency is usually used to assess the level of development of the chip.

Secondly, generally do not use in the application environment of the lamp efficiency, but I am quite used to assess the quality of a batch of love beads, is not consider driving conditions, the ratio of direct consumption of lamp on the lamp panel and the lamp panel of the total luminous power. The average number of lumens of luminous efficiency of tile so calculated can reflect a number of beads, so as to determine the quality of a batch of beads.

In addition, the efficiency of the drive may be more familiar with the people, that is, the ratio of input to drive power and drive output power is the conversion efficiency of the drive.

The last one is the focus of attention, that is, the whole lamp luminous efficiency. This formula is very simple, that is, the total luminous power and the total input power ratio. Due to the structure of the light light conversion efficiency may be a special point, the whole lamp structure light rate = light / total lamp panel light emitted by the total conversion, defined as the ratio of emitted on the lamp panel light and by the end of the whole light, of which at least one because the expansion plate or transparent plate of light attenuation.

In common propaganda, people often confuse the luminous efficiency of the luminescent efficiency of the whole lamp and a single bulb. The relationship between them, we can roughly that of the whole lamp luminous efficiency = application environment improved luminous efficiency - driven conversion efficiency - the structure of light conversion efficiency.

In this relationship, we can see that the luminous efficiency of the lamp should be less than the light emitting efficiency, besides the impact of the above mentioned drive conversion efficiency, there is a problem often neglected, is the effect of the lamp structure. The effect of the lamp structure not only refers to the effect of the diffusion plate brings, especially for the side emitting type lamp, the light conversion efficiency is very low, can be said to be a bottleneck of the side emitting type lamp. So, if we say that the whole lamp luminous efficiency, should be deducted from the conversion efficiency of the drive and the conversion efficiency of the lamp structure.

Efficiency is a complex concept in LED lighting. At the same time, we must also point out that efficiency is not static, but will change with the change of the working environment, such as the temperature of the work will make the efficiency change. So when we talk about the efficiency of the LED, we should not only make clear what is the efficiency, but also point out what is the efficiency of the environment.