What are the main parameters of LED lights
Parameter description of LED Bulb lights
1, color temperature: conventional color temperature: warm white light (WW) 2700-3200k, natural light (NW) 4000-4500K, positive white light (PW) 6000-6500K, cold white light (CW) 7000-7500k [here cold white light is different from the cold white light of the jewelry lamp, jewelry lamp cold white light is generally 15000-20000K] In addition, red, green Blue and other single colored light beadschang can also do.
2, power: LED bulb lamp general power are below 12W. Common LED bulb light power is divided into: 3w, 4w, 5w, 6w, 7w, 8w, 9w, 10w.
3, voltage and current: voltage and current is also a very important basic parameters of the LED bulb lights. The voltage of the power grid in different countries in the world and the voltage used on certain occasions is different. Commonly used voltage is 12v, 110v, 220v, 85v-265V. current is divided into input current and lamp bead current. First: input current: you can use the power supply test out, different power is not the same, subject to the instrument. Second: lamp bead current: general high-power are to 300mA-320mA- between. Current has a great impact on the light decay of LED lights, so the stability of the current is also very important. Lamp bead current and voltage can not be given too much, otherwise it will seriously affect the life of the LED lamp.
4, light efficiency: light efficiency is also a very important factor for LED bulb lights. At present (August 2013) so far, the luminous efficacy of the lamp beads with chips such as Nichia and KOREI is generally about 150-0Lm/W. Here do not take into account the luminous efficacy of the laboratory environment test, at present (2013-April) so far, the highest luminous efficacy under the laboratory announced by KOREI is 276Lm/W], the current domestic lamp beads with Taiwan chips luminous efficacy of the basic 100-130Lm/W up and down.
5, luminous flux: luminous flux is mainly determined by the luminous efficacy and power of LED bulb lamp. Generally measured by the integrating sphere.
6, illuminance: illuminance generally lighting designers will consider more, in general, we consider very little. The unit of illuminance is lux, English Lux, now can also be abbreviated as Lx. 1 Lm of luminous flux uniformly distributed on a surface of 1 square meter of light illumination produced. Illuminance is usually measured by illuminance meter, illuminance meter is simple to use, cheap to buy, in the absence of integrating sphere system can be used to measure the illuminance meter as some reference.
7, light decay: light decay in layman's terms, is the bulb lamp after a certain period of time, how much the brightness has dropped. The most important factors affecting the LED light decay is heat dissipation and current. Unstable current, poor heat dissipation, light decay will be very serious. If the LED bulb is used in isolated constant voltage + constant current LED driver power supply, car aluminum lamp housing heat dissipation, the light decay is controlled within 2 ‰.
8, color difference: color difference is the inconsistency of color temperature, generally warm white light (2700-3200k) will take into account the color difference problem. Warm white light is what we usually say yellow light, sometimes we buy two of the same brand, the same power yellow light energy-saving lamps, lit in the same environment, will find a light color is brighter, a light color is darker, this situation is the color difference. In some occasions, the color difference is felt not allowed to appear.
9, color rendering: the degree of light source to the object itself color rendering is called color rendering, that is, the degree of color fidelity; light source color rendering is indicated by the color rendering index, which indicates that the object in the light color than the reference light (sunlight) when the color deviation, can more fully reflect the color characteristics of the light source. High color rendering of the light source on the color performance is better, we see the color is close to the natural color, low color rendering of the light source on the color performance is poor, we see the color deviation is also larger. The International Commission on Illumination CIE set the sun's color rendering index at 100, the color rendering index of various light sources vary, such as: high-pressure sodium lamp color rendering index Ra = 23, fluorescent tube color rendering index Ra = 60 ~ 90. Color rendering is divided into two types: faithful color rendering: to correctly express the original color of the material need to use the color rendering index (Ra) high light source, its value is close to 100, the best color rendering. Effect color rendering: to clearly emphasize the specific color, the performance of the life of beauty can be used to enhance the color rendering effect.
10, glare: the field of view of extremely bright objects or strong brightness contrast, it can cause visual discomfort called glare, glare is an important factor affecting the quality of lighting.
11, service life: LED in the general description, are available for more than 50,000 hours, there are some manufacturers claim that its LED can operate about 100,000 hours. The main problem in this area is that LED is not simply no longer operating, it is not rated service life can not be calculated using the traditional method of measuring lamps. In fact, when testing the life of the LED, no one will stay around waiting for it to stop functioning. However, there are other ways to measure the life of LEDs. LEDs last because they don't have the problem of filament meltdown. LEDs don't stop working straight away, but they degrade over time. Some predictions show that high-quality LEDs can maintain more than 60 percent of their initial light brightness after 50,000 hours of continuous operation. Assuming that the LED has reached its rated service life, it may actually still be emitting light, only the light is very weak. To extend the life of the LED, it is necessary to reduce or completely dissipate the heat generated by the LED chip. Heat is the main reason why LEDs stop functioning.