Outdoor LED Light PCB To Buy The Three Major Errors?

Outdoor LED Light PCB to buy the three major errors?
1 Misunderstanding 1, the expectations of the actual life is too high
LED manufacturers expect Outdoor LED Light PCB to reach 100,000 hours MTBF (average time between failures, traditional lighting manufacturers use the standard for measuring light source life). However, like all basic light sources, the luminous flux of Outdoor LED Light PCB also fades with time. Therefore, 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 attenuation is also affected by control, thermal management, current levels and many other electrical design considerations.
Many sales staff in the promotion of LED for some reason may give customers to provide some fuzzy information, resulting in misleading, such as Outdoor LED Light PCB life of 100,000 hours or so, where the 100,000 hours is the manufacturer expected Outdoor LED Light PCB Service life. But as a light source of lighting, the brightness of the lamp has a gradual decay of the process of darkening (such as fluorescent lamps, energy-saving lamps), this process referred to as light failure. Therefore, consumers in the purchase of Outdoor LED Light PCB to pay attention to its speed of light, rather than the use of time, consumers do not expect the actual life expectancy is too high.
2 misunderstanding 2, the actual angle of light as an effective angle
Outdoor 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.
Therefore, consumers in the purchase of Outdoor LED Light PCB products should pay attention to the actual product light angle, calculate the number of products used in the project, the actual luminous angle shall prevail, the effective light angle can only be used as a reference value.
2 errors Third, the greater the power the higher the brightness
The brightness of the outdoor LED light is measured by the luminous intensity. The luminous intensity refers to the luminous intensity in the direction of the normal (for the cylindrical arc 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, In the Outdoor LED Light PCB, 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. Therefore, consumers in the purchase of Outdoor LED Light PCB to pay attention to its axial brightness, rather than power
There is a part of the bad business, doing Outdoor LED Light PCB when the use of low power lamp beads to do, such as the use of 0.3W or 0.5W lamp beads to replace the 1W power, because the product power is low, the lamp and power Prices will be greatly reduced, where the lamp beads is the cheapest, for the product life and stability will be a short cut, specifically how, I do not do evaluation here! (For the lamp beads are now like Taiwan's packaging is generally about a dollar, the United States Purui to 2 yuan a lamp beads)
Shell with the most light out of the package, the cost of a lot of cheap aluminum, but also reduce the cost. Outdoor LED Light PCB cooling is very important, we can see how Outdoor LED Light PCB to solve the heat problem, if the use of low-cost box, there may be due to high heat and can not afford the box, there may be a fire hazard.