What is the meaning of LM90B50 of LED lighting lamps?
L defines the percentage of lumens compared to the initial lumens.
This means that the luminous flux of the luminaire that has been operating for a period of time is compared to the initial luminous flux of the luminaire. L70 means that the flux is reduced to 70% of the original flux, L80 means that it is reduced to 80%, and L90 means that it is reduced to 90%.
B value represents the fault data at data L.
B10 indicates that 10% of leds cannot meet the requirements.
Thus, the LB value represents the actual life of an hour.
L/B is the standard definition of lamp life
For example, 50000h(L90/B10) means that it takes 50000 hours for 10% of the product‘s luminous flux output to drop below 90% of the initial value.
Conversely, it means that LED products have the reliability of light decline less than 10% after 50,000 hours of work.
TM21
Tm-21: It is mainly combined with LM80 report and ISTMT report to calculate the life of the whole lamp.
TM21 provides processing methods for the measured data of LM80, mainly including the following contents:
A. Data fitting method in the ...【See More】
Q:
What are the sterilization and bacteria purification effects of air purification lamp?...
Air purifying lamp, also known as disinfection sterilization lamp, air purification lamp main effect is to decompose indoor air pollution, healthy fresh air outdoor and indoor air displacement, thus ensuring the indoor air quality【See More】
Q:
Design standard for lighting fixtures of rail transit
1. Energy saving and high efficiency: the lighting system accounts for 13% of the total energy consumption of the subway power system, and the average energy consumption of the subway lighting is 26W / m2, which is far higher than the average standard of 6W / m2 in other places of the country.
2. Stable and reliable, long life: in the underground, the density of people is high, the lighting time is long, the intensity is large, the reliability and stability of lamps and lanterns are high, and the service life is long.
3. Lighting is divided into multiple levels: entrance and exit passageway, station hall, platform, carriage and track. Due to natural light, passenger flow density, comfort and other factors, the demand for lighting is different.
4. The design is complex and limited: the subway system includes strong and weak current system, fire protection system, operation system, monitoring system, exhaust system, etc. the lighting design not only needs lighting effect and human feeling, but also needs to take care of other subsystems.
5. Highlight the artistry, culture and urban style: subw...【See More】
Q:
Why is the display index of LED education lights, that is, RA index, above 90?
The most authentic and original color of things.
Well, sunlight is a natural light source that people and other organisms have gradually adapted to in the process of evolution. Therefore, it is generally believed that sunlight is the most healthy and harmless. However, in real life, many times we need artificial light source to meet the needs of our life, but there are also advantages and disadvantages of light source.
It is generally distinguished by the color rendering index
RA: 90-100 excellent
RA: 80-89 good
RA: 60-79 normal
RA: 40-59 poor
RA: 20-39 poor
The closer the color rendering index is to 100, the better the color rendering performance is. RA reaches 90, indicating that the light source is close to the sunlight, which means that the color rendering is close to the sunlight; Then the subject also talked about the eye protection lamp. My personal understanding is that the color rendering index of the light source is close to 100, which only means that the secondary light source basically restores the original color of the object. At the same time, the light source ...【See More】
Q:
How to simply see if the LED light has a strobe
A simple move: directly use the camera function of the mobile phone to face the lamp at close range (different brands may have differences, if two different brands of mobile phones shoot without ripple), it means that the lamp has no stroboscopic eye protection, if there is wave motion in the picture, it means that there is stroboscopic【See More】
Q:
Classification of light sources
Classification of light sources:
① Combustion luminescence
② Incandescent: incandescent lamp, halogen lamp
③ Gas discharge: fluorescent lamp, mercury lamp, sodium lamp, metal halide lamp
④ Electroluminescence, laser: electrodeless lamp, xenon lamp
Note: LED is a kind of solid-state light source of "cold light source". Incandescent lamp is the first generation light source, ordinary fluorescent lamp is the second generation light source, and other gas discharge lamps are the third generation light source except fluorescent lamp. The fourth generation light source (X-ray laser) is a new generation light source under exploration after the third generation gas discharge light source The coherence and time structure are much better than the third generation gas discharge light source....【See More】
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