Pointer to the important technical specifications of LED industry need to be
improved
In response to the global trend of environmental protection, the
rise of the LED lighting industry, there are a large number of technology
companies to invest in this emerging industry, but because of the trust
performance standards for LED lighting can not provide for real-time, properly
specification, resulting in a large number of products can not pass the test
seriously bad light end, mainly due to is a design theory studies to examine the
pillar, resulting in the use of the owners concerns, and the delayed timing of
industrial development. LED lighting program supplier Xinyuan Sheng Technology
(Thermoking), provides a high-performance LED street a number of components to
the lighting system of the important pointer specification data, for reference
by the industry. Pointer part of the key technologies in the luminous efficiency
of the LED chip and packaging components, Xinyuan Sheng said that the first LED
chip and packaging components critical technology, manufacturers have been in
the U.S, led bulbs home sales., Japan, produced a breakthrough more than 100
luminous efficiency of 120lm / W, beyond traditional maximum efficiency of the
HID light sources (light-emitting efficiency of 90 to 110lm / W), to solve the
lack of lighting illumination ≧ 45lm / W problem to meet the road lighting, long
life light fades low average illumination of compliance with international
standards, specifications and energy savings of 30 at 25 ~ 40Lux ~ 50% of
demand. The LED luminous efficiency, temperature rise and life specifications of
the key technical pointer part, to view the data released by the CREE, Osram LED
industry, chip PN junction operating temperature Tj <85 ° C in order to
ensure that the working life of 50,000 hours, and the chip PN junction to the
heatspreader (Tjs) temperature rise of ΔT = 6 ~~ 15 ° C between the other LED
light efficiency is inversely proportional to the operating temperature
performance characteristics, each increased by 10 ° C will lead to a light
decline 5 to 8 percent, and lifetime halving the serious consequences, a far cry
from the concept of general publicity, LED can work up to more than 100,000
hours at 100 ℃ for life, http://avosblogs.com/johnsonpaul/2012/08/01/led-spotlight-ut-compared-to-the-technically-in-europe-and-americ/
.
In the LED street lighting system, heat transfer cooling the ambient temperature
key technologies pointer part of Xinyuan Sheng Technology pointed out that such
lighting system operating temperature shall not exceed 85-10 = 75 ℃; ITRI LED
lighting demonstration lighting specification, the durability test The ambient
temperature is 60 ℃, street lamp cooling system temperature rise must be less
than the ΔT of ≦ 15 ℃. The company 150W LED street lights, for example, heat
transfer, cooling system temperature rise test as low as ΔT ≦ 12 ~ 15 ℃,
calculate the thermal resistance of Tr = 0.08 ~ 0.1 ° C / W, and the general
design of the system temperature test ΔT ≒ 30 ~ 40 ℃, the calculation of thermal
resistance Tr = 0.2 ~~ 0.26 ° C / W, life will be shortened by two times and the
light fades by more than 15%. In addition, the 350W LED lamp test, the cooling
system temperature rise still reached ΔT = 15 ℃, the thermal resistance of Tr =
0.04 ℃ / W LED street part of the system cooling technology, Xinyuan Sheng said,
electronic machinery and equipment heat transfer, heat for low-power low-level
natural radiation has reached the temperature rise by 1 ~ 70W products, systems
such as MR16/PAR30 30 to 40 ℃, e27
led light bulb
. If the more than 100 ~ 250W still use the natural cooling
methods, like most of the products currently on the market, you must use a large
number of aluminum alloy to increase the conduction of heat and a large heat
exchange area, volume weight 15 to 30Kg ranges. Low-level natural radiation the
law to use the more severe the greater the area of metal material to lower the
temperature, the better, but only the aluminum alloy material costs to increase
30 to $ 70; However, if the switch to high-reliability industrial grade air
conditioners air conditioning, initiative forced cooling methods used by the
computer's CPU and high-end power products, high efficiency, small fan of life
of military regulations to ensure that 50,000 hours, and have IP65 waterproof
and dustproof, tested, lighting system, the temperature rise can be as low ΔT ≦
12 to 15 ° C, with natural cooling methods to cool by up to 20 ° C, life
expectancy will increase by 2-fold increase in the brightness of the light
extraction efficiency of more than 15%. In addition, the design of general the
LCE lighting products were not considered a dust protection system, it is
necessary to completely prevent the sand dust storm, gravity dust accumulation
on the thermal structure in order to avoid the cause of LED overheating. Thermal
structure toward the day surface resulting in the accumulation of dust, heat
accumulation can not be divergent, it may cause the LED light failure and
burning conditions. The Xinyuan Netsun said that to solve the above problems can
be designed using the thermal structure toward the ground to cope with.
Resistance to salt spray testing, etc., existing products, outdoor test time of
15,000 hours, the light fades <10%, in good condition. Trunk road lighting
optical design can be up to world standards, 10 meters high poles must
illuminate the average banner 40 meters long road to solve the difficult optical
lens design, to achieve the requirements of high aspect ratio 1:4. Another core
wick technology module also reached the light of that does not rely on the light
shell as a heat sink, the shape of the exterior design of the lamp body can be
changed to reach the beautiful characteristics of each city, http://johnsonpaul.comicspace.com/2012/08/01/e27-led-bulb-f-raw-materials-needed-by-japan-t/
.
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