Everything has a process of occurrence, development and demise. LED is no exception and has a certain life span. The early LEDs were just gifts such as flashlights and desk lamps. The time spent was not long and the life problem was not outstanding. But now LEDs have begun to be widely used in outdoor and indoor lighting, especially high-power LED street lights, which have high power, high heat, long working hours, and long life problems. In the past, the myth that LED life must be 100,000 hours seems to have completely shattered. So where is the problem?
If the failure of the power supply and the drive is not considered, the life of the LED is manifested by its light decay, that is, the time is long, and the brightness becomes darker and darker until it is finally extinguished. A time of 30% attenuation is usually defined as its lifetime.
So can the life of LEDs be predicted? This question cannot be answered simply and needs to be started from the beginning.
1, LED light decay
Most white LEDs are obtained by illuminating a yellow phosphor with a blue LED. There are two main reasons for the LED light decay. One is the light decay of the blue LED itself. The light decay of the blue LED is much faster than the red, yellow and green LEDs. Another is the light decay of the phosphor, which is very attenuated at high temperatures. The light decay of various brands of LEDs is different. Usually LED manufacturers can give a standard set of light decay curves. For example, the light decay curve of Cree in the United States is shown in Figure 1.
Figure 1: Cree's LED light decay curve
It can be seen from the figure that the light decay of the LED is related to its junction temperature. The so-called junction temperature is the temperature of the semiconductor PN junction. The higher the junction temperature, the earlier the light decay, that is, the shorter the lifetime. As can be seen from the figure, if the junction temperature is 105 degrees, the lifetime of brightness reduction to 70% is only 10,000 hours, there are 20,000 hours at 95 degrees, and the junction temperature is reduced to 75 degrees, and the life expectancy is 50,000 hours. It can be extended to 90,000 hours at 65 degrees. So the key to extending life is to lower the junction temperature. However, these data are only suitable for Cree's LEDs. Not suitable for LEDs of other companies. For example, the light decay curve of Lumiled's Luxeon K2 is shown in Figure 2.
Figure 2: Light decay curve of Lumiled's LuxeonK2
When the junction temperature is raised from 115 ° C to 135 ° C, the lifetime is reduced from 50,000 hours to 20,000 hours. The light decay curves of other companies should be available from the original factory.
Smart solar outdoor light with both lighting and RGB colorful lighting, can be charged with USB and solar panel. Once it has sunlight, the solar panel can be automatically charged , the charging way is very environmentally friendly. We added a USB charging way so that it can be quickly charged via the USB cable in cloudy day or rainy day.
The outdoor light is solar-sensing, it will automatically turns off when in the bright enviroment, then begin to charge by solar. When the night comes, it will automatically turn on in the dark. Waterproof IP65 makes users no need to worry when using in the rainy day.
Equipped with a detachable plastic sticker, it can be used to decorate the lawn, garden, beach... After removing the plastic sticker, it can be placed on the table as an ambient light. They will be stars fall into your garden, twinkle in the dark and go off in the day. Automatic cycle colorful mode makes parties begin at anytime and anywhere.
Our LED products can meet global quality standards and pass European testing by TUV Rheinland. Bulbs have certifications such as EMC, RED, LVD, ROHS, REACH, ERP and FCC.
With the exclusive designed 2.4G remote controller, get you off the switch and turn on / off the lights anywhere, one remote controller can set 4 groups, each group is recommended to match up 8pcs bulbs, one remote controller can max control 32 bulbs. This remote controller is suitable for all 2.4G versions of RGBW products under [linkuphome".
The remote control uses colorful touch buttons, the color touch buttons are comfortable and sensitive. The remote controller has the functions of grouping, lighting, brightness adjustment, color light automatic cycle mode, three cycle speeds can be choosed. The wireless control distance is around 20 meters. Low power consumption makes the remote controller only need 4pcs AA batteries, but can be used for two years.
Description: RGB Outdoor Solar Lamp with 2.4G Control
Product Model No. C2
Product dimension: 155mm *165mm
Material: ABS+PC
Lamp Color: 8pcs RGB lamp beads+4pcs Warm White lamp beads
Lamp Current: 15-20mA
Power: 0.5W (15LM)
Battery Capacity: 1000mA (Li battery included)
Battery Voltage: 3.7V
Battery Duration: 9h(by USB charge for 1.5h) , 5h(by solar panel for whole sunny day)
Solar Panel: Monocrystalline silicon
Solar Panel Voltage: 6V
Solar Panel Output: 130mA
Waterproof Level: IP65
Control Qty: 1-32pcs
Packing: color box
Warranty: 1 Year
Charge Mode: Solar Panel and USB
Control Distance: 20m
Color box size: 22.2*20.6*5cm
G.W. of Unit: 0.55kg
N.W. of Unit: 0.34kg
Certification: CE(EMC,RED) ROHS,IP65,FCC
Description: 2.4GRF Wireless RGB Remote Controller
Product Model No.: R1
Product dimension: 105mm *33mm,
Product Net Weight: 150g
Material: ABS
Battery: 4*AA Battery (not included)
Working Voltage: 6V
Standby Power: 3 mW
Frequency Band: 2400-2483.5MHz/2.4GHz
Control Distance: 20m
Control bulb qty: 1-32 pcs
Packing: color box
Warranty: 1 Year
Color box size: 16.7*14.7*4.5cm
G.W. of Unit: 0.22kg
N.W. of Unit: 0.15kg
Outdoor Lamp With Remote Control
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Ningbo Homey Photoelectric Technology. Co., Ltd , http://www.linkuphome.com