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4:50 am
2011/10/27
Offline
Quote|
LED lighting is the biggest selling point for energy saving,But often the market limited to the cost of the product,
materials, and cooling technology,Make the demand for energy saving light efficiency of the discount factors. Energy saving at
present mainly reflects in the following two aspects:
一, the maximum energy into light energy;
二, the light maximum control to fit for human senses.
From now LED application field with the problem and see,The above two apparently isn't good enough.First is the "hot" problem
LED, now that exist heat dissipation problems, that means the yield of LED heat is considerable.We can be simple to analyse
the problems and LED what LED the heat produced in the:
1. Now that LED to the yield of high quantity of heat can influence the Angle of heat, temperature is obviously.
About LED light source sealing glue, what kind of material to withstand the heat for tens of thousands of hours baking? Of
course even have such high quality material, but high prices will let people money.
2. The problem about life, actually very simple, LED chip heat release LED light source itself can affect the life expectancy,
lead to light failure; In addition, still can affect LED lamps aluminum plate board of life.
3. It is for LED lamp heat generation, so need to heat dissipation. The lighter than plastic, metal, the thermal conductivity
is much better, but also much more cumbersome, of course, also more expensive.
Next is the light sensor. Why in the GaoLiuMing LED lighting, we still feel blurred vision? Specific reason to have the
following two points:
1. Our eyes to long-term natural light,And at present almost all the LED lighting products are monochromatic radiations,
Relative to our eyes,Whether warm color or are white,Total monochromatic light are not good reduction objects the color of
itself.
2. LED lamp produce monochromatic light, although the lumen is larger,But as far,So we in the LED lights have such feeling,
From the lamp near the special dazzling; Far and away from light feeling brightness enough; In contrast, the effect of warm
color a little bit better.
The high power LED light source can reduce the heat produced
When 3528 light source birth suspension,5050 before the light source position is starting to waver,Many friends in the earlier
"is 3528 light source.Reason is the narrow 3528 properties,Sales up no 5050 so easy.And now, those who complain about 3528
light source friends in the appropriate time make a barrel of gold,Now more than 70% of the indoor lighting products are used
3528 light source. Its actually use 3528 light source though can be the cost savings,But at the same time also can bring some
technical problems.
In general case,1 the 1 W light source a hour to produce about 3000 joule heat,And two 0.5 W light source of calories an hour
in about 3500 joule heat,So for energy saving,The latter the light low efficiency,With a 5 W ball steep light, for example, if
you use single 1 W light source, the pure light source of calories an hour in about 15 K joule; And the 0.5 W of the source of
the light, the light source of calories an hour in about 16.5 K joule.
By This Inference ,Equal power,The 3528 light source than with 5050 in more light source heat,That is normally, the lamps and
lanterns of same power,High power than small power source of light source the light rate,
At the same time in the same power under the premise of light source, with the increase in the number of light source, the
yield of aluminum plate heat also can increase accordingly.
In addition, 5630 this LED encapsulation body, also has international manufacturers in use, but the technology to the
threshold of the higher, is currently has the technical force of the manufacturers to gain advantage.
As is known to all, the light source heat and chip in with absolute relationship,So in the control of the heat lamps in, in
addition to consider to choose the high quality chip packages of the source of the light.
And as far as possible much consider the number of bead light. And now a lot of manufacturers to cater to is the market, have
to use the small power source of light to control the cost to increase market competitiveness,Of course in high power source
heat compared with little power is no edge, but with high power source of light failure this weakness be solved step by step
and price decline, later in the market application should have good performance.
Light sensor problem can use light mix build or chimney processing.
Currently LED by monochromatic light show color index is low this problem,
Many companies already started developed a wide range of color temperature to mix the lamps and lanterns,
Of course such effect may cause light or uneven phenomenon, this to the chimney and lens set the new request. Such as using
high light transmittance grind arenaceous lens is pervious to light quality good milky white chimney
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8:07 am
2012/01/20
Offlinehi frnd,
this is highly accept concept. now days many peoples considering ennergy saving and enviornment controls. This LED lighting impliment make all this things.
this is very good post
11:00 am
2011/12/28
OfflineDear all
Proposes a discussion of the supplying power LED luminaires.
Exactly i want to touch subject; the requirements for the power supplies AC / DC in LED installations and their impact on supply systems - wiring and power quality.
One of the factories ordered a replacement 700 pieces of lighting fixtures with line fluorescent tubes in to - LED source.
Unit power by contractor provider for one luminaire has parameters:
Measurement data of one fixture:
I = 0.43 A
P = 58.7 W
Q = 83var
S = 102.5 VA
cosfi = 0.58 (should be PF - probably)
Data obtained from data scheet (IE) of manufacturer, determine compliance with standards:
EN55022 (CISPR22) Class B, EN61000-3-2 Class A, EN61000-3-3
but not compliance with standards described bellow:
"In the European market this product is only Suitable for LED lighting applications That Do not Have To Comply With The Requirements of harmonic current EN61000-3-2 Class C".
Therefore - this rectifiers should not be applicable in industrial environments. Is it really?
Due to the fact that power supplies (rectifiers for LED luminaires) are one-phase and judging by the PF value (and price) are equipped with the most simple rectifier.
Therefore I expect to appear the growth of third harmonics in cables in supply system, coused by large number of single-phase non linear power rectifiers.
Please support and welcome to the discussion?
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