Analysis of mistakes in purchasing LED lamps

At present, the LED industry has entered a period of deep integration. With the official implementation of relevant government support policies and the maturity of LED technology, the output value of LED lighting industry will see explosive growth in the future. Market LED lighting permeability is fast improve 2014 LED lighting output value will reach 17. 8 billion beauty yuan overall LED lighting product shipment quantity up to 13. 0. 2 billion, up 68 from 2013. The agency believes that the replacement tide of LED lighting products comes from the rapid decline in prices, among which the replacement light source products are obvious, and bulb lamps and lamps are the popular replacement light source types in the market, they accounted for 38 and 25 of LED lighting products in 2013 respectively. In addition, the demand for integrated LED lighting products will gradually rise in the future, especially those combined with intelligent lighting applications. Therefore, it is expected that the proportion of LED lighting products will increase year by year in 2014. However, although the LED industry has been growing at a high speed, due to the lack of LED technical standards, overcapacity and vicious competition among enterprises, many LED lighting products have failed to pass the test, it also makes consumers turn pale when they talk about LED lights. So, what minefields do consumers need to pay attention to in the specific purchase process? Inventory: Misunderstanding of LED lamp purchase, misunderstanding 1, high expectation of actual service life. LED manufacturers expect LED life to reach 100,000 hours MTBF ( Average time to failure, standard for measuring light source life used by traditional lamp manufacturers). However, like all basic light sources, the luminous flux lumen of LED also decays with time. Therefore, although the LED lighting time can be very long, MTBF is not a 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 attenuation is also affected by control, thermal management, electrical flow level and many other electrical design considerations. Many salesmen may provide some vague information to customers for some reason when selling LED, causing misleading. For example, the service life of LED is about 100 thousand hours, 100 thousand hours here refers to the service life expected by the manufacturer. However, as the light source for illumination, the brightness of the lamp has a process of gradual attenuation and darkening (Such as fluorescent lamps, energy-saving lamps)This process is referred to as light decay. Therefore, consumers should pay attention to the light decay speed of LED when purchasing, not the use time. Consumers should not expect too much about the actual service life. Misunderstanding 2, take the actual lighting angle as an effective angle. The luminous angle of LED is divided into effective angle and actual luminous angle. The direction in which the luminous intensity value is half of the axial intensity value and the Luminous Axis (Normal)The included angle of is an effective angle. Twice the half-value angle is the viewing angle (Or half power angle)Is the actual lighting angle. The angle outside half of the axial strength is not included in the effective angle in practical application because the light is too weak. Therefore, consumers should pay attention to the actual luminous angle of the product when purchasing the product. When calculating the number of products used in the project, the actual luminous angle shall prevail, and the effective luminous angle can only be used as a reference value. Myth 3: The higher the power, the higher the brightness. The brightness of the LED is measured by the luminous intensity, which is the fingering line (The cylindrical luminous tube refers to its axis) The luminous intensity in the direction, that is, the luminous flux emitted per unit solid angle, in candlelight (Candela, cd). Because the luminous intensity of general LED is small, the luminous intensity is commonly used in millicandra (mcd)As a unit. Generally speaking, the light source will emit its luminous flux in different directions with different intensities. The visible light radiation intensity emitted by the unit solid angle in a specific direction is called light intensity, which is referred to as axial brightness. The concept of electric power is introduced from the amount of work done by the force in the same time. If the current does work quickly, the electric power will be large; If the current does work slowly, the electric power will be small, or in the same time, the more work the current does, the greater the electric power will be. On the LED, it is not the greater the power, the higher the brightness of the product. Take the three-lamp red LED of Yimei electronics as an example. When the axial brightness is 1200mcd, the current is 40ma and the power is 0. 48 W; Under the same brightness, the current of the three-lamp white LED is 18ma and the power is only 0. 24 W; It can be seen that the power of the two lights is different at the same brightness. Therefore, consumers should pay attention to its axial brightness, not power, when purchasing LED lamps.