LED will certainly become the fourth generation of lighting, its development momentum more and more fierce, the main advantages are: energy saving, long life, no flicker does not hurt the eyes, do not attract mosquitoes. High-power LED lighting as long as the thermal design is good enough, 3-5 million hours of life is no problem (life is defined as: LED because it is a semiconductor component, the chip affected by the temperature will produce light failure, when the LED luminous flux because Light attenuation of less than 30% of the initial luminous flux, the basic LED lighting is no lighting significance, that is, life summary, although this time the LED lights can still light it, but the brightness has dropped significantly, so LED lighting is very Important is important).

You said the LED lights out of the object will be color cast, because the spectrum is missing a color, which is the wrong idea. Very simple reason, color TV (CRT) is not only three primary colors (red, green, blue) mixed to get a variety of colors. Lighting is the use of high-power white LED more, mainly blue-chip excitation phosphor mixed white light. I want you to say that the object will be exposed to color, mainly caused by two factors:

1. The LED color rendering index used is too low, causing the emitted light to not reflect the true color of the object. (Light source on the object's color rendering capacity known as color, color rendering index Ra up to 100, the best color) The current LED color rendering index of 80-85, then, has been very good, can be used indoor lighting.

2. The LED color temperature used is not good, the simple understanding can be considered the color of light. Color temperature is low, then the light will be out of the green partial red, too high will be blue, are not suitable for indoor lighting. So the indoor lighting on the LED lamp color temperature is a very important parameter. LED generally defined color temperature in the 2700K-4000K for the warm, 4000K-5000K for the natural white, 5000K-6700K for the white, warm white and natural white temperature will give a warm, warm feeling, suitable for use in hotels, hotels, and bedroom. While the white is to give people cool cool feeling, for the office, living room lighting more (fluorescent light is generally more of this color temperature).

Brightness equivalent to 100W energy-saving lamps, it depends on the luminous effect of the LED lamp used (lumens / watt, lm / w), the same wattage, the higher the luminous efficiency of LED lamp, the higher the brightness. General LED lighting efficiency of 70lm / w, as long as there are 50-60W will be able to more than 100W energy-saving lamp brightness.

Another indoor lighting I really have not seen to 100W energy-saving lamp brightness, At least our company is not producing more than 60W LED indoor, Finally to say is to buy LED lamps to pay attention to see light effect, color temperature, color rendering index, light failure. The first three are common parameters of all LED lamp, the last light failure is LED as a unique property of the semiconductor.

Also in the choice of LED lamp when some people have the following errors!

Misunderstanding 1, the actual life expectancy is too high.

LED manufacturers expect LED life to reach 100,000 hours MTBF (The average time between failures, the standard used by traditional lighting manufacturers to measure the life of the light source). But, like all basic light sources, like LED The luminous flux also fades with time. So although the LED light-emitting time can be very long, MTBF is not the only consideration to determine the service life. The attenuation of LED lumens is affected by many environmental conditions such as ambient temperature, humidity and ventilation. Lumen fading is also affected by control, thermal management, current levels and many other electrical design considerations (cited above for US CK).

Many salespeople in marketing LED for some reason may give customers to provide some fuzzy information, resulting in misleading, such as LED life of about 100,000 hours, where the 100,000 hours is the manufacturer expected LED life. As the light source of the light, the brightness of the lamp has a process of gradual decay and darkening (such as fluorescent lamps) , Energy-saving lamps), this process referred to as light failure. In the application-level LED, the light failure of more than 50%, the human eye can clearly feel the brightness of the change, then the product brightness we think is not suitable for lighting. Many manufacturers and engineers in the use of low-cost LED three months to six months or so, often found that the brightness of LED is not as bright as the installation of light, or even almost no, it is because the LED lamp failure did not take into account the reasons. In summary, we have to pay attention to the purchase of LED light decay of its speed, rather than the use of time.

Misunderstanding 2, the actual angle of light as an effective angle.

LED light angle is divided into effective angle and the actual light angle. The luminous intensity value is half the direction of the axial intensity and the direction of the light-emitting axial (normal) is the effective angle. Half of the half angle of the angle (or half power angle) is the actual light angle. In the axial strength of half the angle because the light is too weak in practical applications do not count the effective angle. (The picture below shows the side view of the piranhas particles, the angle between the solid line and the dashed line is not included in the effective angle)

So we should buy products in the product should pay attention to the actual angle of light, calculate the number of products used in the project, the actual luminous angle prevail, effective light angle can be used as a reference value.

Misunderstanding 3, the greater the power the higher the brightness.

The brightness of the LED is measured by the luminous intensity. The luminous intensity refers to the luminous intensity in the direction of the normal (for the cylindrical tube), that is, the luminous flux emitted by the unit solid angle, in candlelight (Candela, cd). As the general luminous intensity of LED is small, so the luminous intensity commonly used in Mendra (mcd) as a unit. In general, the light source will be different directions to different intensity of its luminous flux, in a specific direction of the unit angle generated by the visible light radiation intensity is called light intensity, referred to as axial brightness.

From the force in the same time to do the power of the number of the introduction of the concept of electric power, the current work fast, electric power is large; current work slow, electric power is small, or in the same time, the more power to do more power, On the LED, not the greater the power, the higher the brightness of the product. To the United States and the United States electronic light red LED, for example, axial brightness of 1200mcd, the current is 40ma, power 0.48W; three lights white LED at the same brightness, the current is 18ma, power is only 0.24W; The power of the two kinds of light at the same brightness is different. So when we buy LED to pay attention to its axial brightness, rather than power.

Misunderstanding 4, on the white LED module purchase.

1. High brightness (blue and green) white LED is very sensitive to static electricity, is determined by the characteristics of the LED itself. Exceeding the maximum forward DC current and maximum reverse voltage that it can allow, it may cause damage or breakdown of the LED. Such as three-lamp LED module, each lamp will have an anti-static resistance, coupled with the resistance for the current limit, a total of four. Anti-static resistance can effectively inhibit the electrostatic damage to the LED.