作者：Blade

Shape designs for T8 LED light tubes

T8 is a code represents a type of tubes with diameters of one inch. T8 LED light tubes are mostly used LED tubes at present. Although the light efficiency of LED light sources is much higher than before, there are still some difficulties in replacing traditional fluorescent tube directly by LED tubes. In accordance with lighting standard of fluorescent tube, a 36W traditional tube should at least have a luminous flux of 2400lm. At present, among T8 LED light tubes, the highest luminous flux is around 2200lm (with a power consumption of 21W). However, cooling system of this kind of tubes cannot be contained within semi-circular pipe but trapezoidal pipe which provides larger spaces. In today’s manufacturing technology, it is impossible to create a T8 LED tube with trapezoidal-shaped cooling components. Cooling system will be the bottleneck for high power T8 LED tubes. According to present lighting efficiency of LED lights, T8 LED light tubes with a luminous flux more than 2000lm will suffer cooling problems. This type of lights cannot work for a long time and more prone to failure. Commonly used T8 LED tubes have a luminous flux of 1300lm-1500lm. This type of LED tubes cannot be used to replace traditional fluorescent tubes. This is a main reason why LED tubes are hardly to be accepted by customers. Many buyers complained that their rooms looked much dimmer than before.

 

T8 is a code represents a type of tubes with diameters of one inch. T8 LED light tubes are mostly used LED tubes at present.

 

In addition, LED tubes tend to follow the step of fluorescent tubes: becomes more and more thin. T5 LED tubes started to emerge in lighting market in few past years. However, this kind of herd behavior is totally wrong. It is an inevitable trend for fluorescent tubes, since a thinner tube can dramatically improve the lighting efficiency of a fluorescent tube. But situations are totally different for LED tubes. The thinner the tube, the harder for the heat dissipation. Meanwhile, spot phenomenon is inevitable if light sources are too closed to the cover, which will reduce light transmission ability of the cover, and consequently the high lighting efficiency of LED lights.

 

Designs of T8 LED light tubes should not be restricted by traditional ideas. Normally, places in which tubes are installed have larger space. It is uselessly to use thin LED tubes, just for a beautiful view? It is unnecessary. Our design object is to satisfy customers’ brightness requirements together with suitable cooling systems.

Filament lamps should not be replaced by super high power LED though power consumption judgment (2)

LED lighting technology is enjoying a rapid development. 15 years ago, a LED street light with a power consumption of 1 watt can only sent out lights of 30lm. 15 years later, a one-watt LED light can have a luminous flux around 100lm (super high power LED). While a 15-watt filament lamp have a luminous flux about 180lm. The development of LED is so fast that it is really hard to replace a 15-watt filament lamp by a LED light with fixed power consumption. On the other hand, power consumption is a parameter used to present electrical energy converting conditions. LED components with high electrical energy converting ability can have a higher luminous flux only consuming very little power.

 

Filament lamps should not be replaced by super high power LED though power consumption judgment

 

Luminous flux, optical spectrum is photometric data typically used to present lighting effects. Why people choose to use power consumption to present the brightness of traditional lamps instead of these more accurate photometric parameters? In the early age, when filament lamps had just been invented, the brightness of a 1-watt filament lamp is approximately equivalent to then light from one candle. Gradually, people related power consumption with brightness. Same situations happed in fluorescent lamps. Nowadays, LED lights have taken the place of traditional lights in many areas. It is improper to represent brightness though power consumption. As for LED Grow Lights, brightness of which is hard to be related with power consumption, can only be clearly represented by more scientific photometric parameters mentioned above.

 

As for light sources of LED lights, luminescence ability can be represented by the light distribution curve measured on their surface. Luminescence ability of the entire LED lights, the light distribution curve should be measured in front of projectors. If two lamps, no matter what type of lamps they are (super high power LED or traditional filament lamp), they will have same brightness if the light distribution curve measured before the entire lamp is similar. Brightness measured though illuminometers are usually different from brightness felt by our eyes. Under circumstances that accurate luminous flux is not necessary, brightness can be roughly represented by the measuring results from illuminometers. Since this method is cheap and easily to be realized.

Investment Opportunities of shop LED Lighting Should Be Judged Rationally

During current years, various aspects of China’s LED industry are packed with industry and non-industry investors and nearly 4000 enterprises found only in the shop LED lighting application side in the past two years. Flowers are flourishing before the spring really comes, which is quite appropriate to describe the status of this industry. On one hand, market participants become more and ambitious; on the other hand, the industry chain develops unevenly. What investment opportunities lie behind this glittering industry? PV industry and wind energy investment boomed a few years ago and now retreat. What lessons can be left to this wave of LED Lights market participants?

Semiconductor lighting is recognized as one of the most promising technology of the 21st century, opening the third revolution in  shop LED lighting of the human society, bringing huge economic benefits. Over the past decade, the average annual growth rate of the global LED downlight market’s scale is over 20%; the growth high brightness LED market is more rapid, the average annual growth rate 46% from 1995 to 2005. The size of the market in 2008 reached 5.1 billion U.S. dollars, accounting for the ratio of the LED market more than 80 percent growth from 40% in 2001, with a conservative estimate that in 2012 the market size is expected to reach $ 11.4 billion.

In this industry chain which is full of highlights and value, the upstream firm took more than 70% of the profits, which is a capital-intensive, high technology content, high rate of return link. The core patented technology of upstream is concentrated in Japan Nichia (Nichia), the United States Corey (Cree), Germany Osram (Osram), and a small number of overseas giants, belong to a typical oligopoly business (Schedule). In the fields of epitaxial wafers and chips, the U.S. and Japanese companies take a monopoly advantage.

Shop LED lighting growth in the mainland should follow the bottom-up path. To think about the early industrial mode, it may be worth LED domestic enterprises to seize market opportunities and grow their own strength.

The LED street lighting market in the turbulent perhaps is a new feast for Chinese manufacturing enterprises. PE should be rational in this area to avoid irrational thinking of the investment in solar energy industry market. On the basis of market-oriented principles to select the appropriate enterprises, it will be illuminate the manufacturer and PE future.

Filament lamps should not be replaced by super high power LED though power consumption judgment (1)

“What is the equivalent LED lamps for xx watt filament lamps?”. “We replaced an energy-saving lamp by a LED down light with much less power consumption, but coming out that it looks much dimmer than before. Should we use a super high power LED instead?” these are questions that would be asked by customers mostly. In fact, this comparison criteria is inaccurate. We cannot judge the brightness of a LED lamp and a filament lamp just tough their power consumption. Traditional lamps like filament lamps and fluorescent lamps, they usually send out a full space light due to their internal constructions. In practical applications, no matter LED lights or traditional filament lamps, all of them will be used together with other reflecting tools, like projectors or other lamp covers with reflecting function. Lamp cover plays a role of light re-distribution. This re-distribution will be different according to different lamp covers used. For instance, straight tubular fluorescent lamp can be mounted either by lamp covers with reflection function or by lamp covers without reflection function. However, the lighting effects are totally different for them, as well as effective luminous flux. Thus, it is improper to compare LED lights and filament lights just though power consumption. To what subject you are comparing? Filament tubes without any other auxiliary components? Filament tubes only mounted by ballasts? Or filament tubes with full set of reflecting components including projectors? This kind of view makes no sense without any premises.

 

Filament lamps should not be replaced by super high power LED though power consumption judgment

 

It is unreasonable to compare LED lights with traditional filament lamps just though power consumption. Traditional lighting sources have relatively stable technology, power consumption is basic a linear relations with luminous flux. Thus power consumption can present brightness to some degrees. While this linear relations cannot be established between LED lights’ power consumption and their luminous flux due to the unstable of the photosynthetic efficiency value of LEDs. Even for super high power LED, there is no such relation. With the rapid development of LED lighting technology, the improvement between the power consumption and the luminous flux will be continued. Thus it is impossible to give out a certain relations between them in near future. Maybe after several years, this problem can be solved. Then we can compare the brightness of LED lights and traditional lights by judging power consumptions.

 

 

Does high efficiency white LED look brighter than filament lamp in same luminous flux? (2)

In previous article, we mentioned about the concept that under different circumstances people feel different light brightness. Even these lights come from the same lamp. The most important reason is that radiations energy will change the brightness of this light in our eyes. For example, if the ground and walls are blue. In same luminous flux, high efficiency white LED looks much brighter than filament lamp. In the optical spectrum of white LED lights, the peak value of the light intensity distribution is between 466nm and 485nm (blue-ray). Thus most of the light coming from white LED lights will be reflected by the ground and walls. On the contrary, if the ground and walls are red colored, more light from filament lamps will be reflected. In such condition, we cannot simply conclude that high efficiency white LED looks brighter than filament lamp in same luminous flux. That is all depends on surroundings.

 

Does high efficiency white LED look brighter than filament lamp in same luminous flux?

 

So far, we have concluded two different results. One is from the measurement result of illuminometer and the other one is from our eyes’ feeling. Differences between them are caused by the unscientific measuring method. In the matter of fact, using illuminometers to measure luminous flux is not as accurate as we all considered. The light measured by illuminometers is light directly coming from light sources, and the light caught by our eyes is mostly from the ground. They are totally different objects. But why designers and engineers still use this method to measure the luminous flux? Firstly, this method is relatively easy compare to other methods. Secondly, it can provide a rough measuring result in most conditions. Finally, illuminometers are much cheaper. These three advantages make illuminometers frequently used in situations that accurate brightness data is not necessary. Many design houses for residential decorations use this method to reduce their cost.

 

In conditions that LED high bay light intensity results are required, methods measuring light intensity are more accurate. Engineers can measure the light intensity on the surface of the ground and walls directly. Values measured by this method will be much more closed to results perceived by human eyes. Brightness meter is an optical instrument typically used to measure light intensity. But this instrument is more expensive than illuminometer and Eneltec LED Flood Lights. In commercial field, brightness meter is not so popular as illuminometer.

Does high efficiency white LED look brighter than filament lamp in same luminous flux? (1)

Does high efficiency white LED look brighter than filament lamp in same luminous flux? This is a rather complex problem. It involves properties relate to human optic nerve system, and also some optical concepts. From the view of the optical measurement, as long as different testing LED lights have same luminous flux, they should look like the same in human eyes. No matter what color they are. However, if the testing object is light radiance, the result will be different. Tow bundle of lights with same radiation energy but different color temperature, will look different in human eyes. A lot of technician did not take these differences into account, leading to the inaccuracy of their testing results. In their opinion, high efficiency white LED street light has been proved much brighter than filament lamps in all conditions.

 

Does high efficiency white LED look brighter than filament lamp in same luminous flux?

 

If using luminous test to compare the brightness of high efficiency white LED and filament lamp, there is one point needs to be noticed: the object should within the same surroundings (consider the radiation energy from the ground reflection), otherwise, the result will be inaccurate.

 

When we design an indoor led lighting products application, the commonly used instrument for testing light intensity near the ground is illuminometer. However, even for the same lamp with same projectors and luminous flux, light intensity near the ground will be different due to different ground conditions. Similarly, we will recognize them as different light since they have different brightness. Illuminometer is a type of instrument typically used to measure light intensity though the optical energy caught by the sensors mounted on its head. When we measure the light near the ground, we are only measuring the lighting coming from light sources. What about other light reflected by the ground and walls? After absorbing and diffuse reflecting by the ground, some light energy converts into radiation energy. The amount of energy all depends on what material the ground and walls used and the construction of the entire room. In other words, light caught by illuminometer is just part of what we have “seen”. That is reason why when illuminometers gave out same measuring result, we feel different light brightness.

LED light consumption only half as much as that of traditional light?(2)

Generally speaking, LED lighting source can emit single direction lights. Super-narrow beam angle design typically used in flashlight applications should not be taken into account. Here we just think about general LED lighting applications. In fact, LED lighting sources used in general LED applications cannot send out 100% single direction lights. There are more or less some lights will be emitted into other sides. After packaging, LED chips even emit light from back. This has nothing to do with the workmanship, materials or quality of LED chips. In widely used LED applications, engineers need to invent projectors with high light-reflecting rate to help reflecting this backward emitting light. No matter what type of material people used to produce projectors or other light reflecting covers, it is inevitable for optical energy to be wasted. But LED light consumption is indeed reduced.

 

Generally speaking, LED lighting source can emit single direction lights. Super-narrow beam angle design typically used in flashlight applications should not be taken into account.

 

We are going the make a small comparison in intensity of illumination between traditional energy-saving lights and LED lights. Feature above shows the different luminous flux between traditional energy-saving lamps and LED lamps (blue line represents the luminous flux curve for energy-saving lamps and red line represents the luminous flux curve for LED lamps). From this picture we can see that the luminous flux of energy-saving lights within 1 meter is approximately 584lm, while that of LED lamps is around 595lm. The luminous flux of these tow lights are similar (The advantage of LED lights is insignificant). All of them are installed by projectors with same reflecting factor. However, when senses held in a distance longer than one meter, LED lamps perform worse than traditional energy-saving lamps. It is obvious that traditional lights can be replaced by LED lights that only consume half power.

 

LED light consumption only half as much as that of traditional light is incorrect. Not only in LED down lights, but also in other LED lighting applications, like LED tubes, LED bulbs, LED high bay lights, LED street lights, this theory cannot be proved. However, without thinking of the reflecting effect of projectors, LED lights consume much less power than traditional lights to have same luminous flux. But the total light consumption is still more than half of traditional lights.

A Light Analysis of LED emergency lighting products

From outdoor to indoor, specialized to generalized, the application of LED high bay is expanding in lighting area. The industry is generally optimistic about medical lighting, led emergency lighting products,  and plant lighting market. Research institutions predict that from 2010 to 2017, LED surgical lighting applications are expected to be high growth rate of 76.4 percent a year. Many companies make efforts to march to the medical lighting. However, compared with the general lighting, medical lighting has a certain degree of particularity in terms of lighting demand or market access.

Where is the medical lighting market access condition at present? How big is the market capacity of medical lighting? How can enterprises find gold in this special led emergency lighting products market? This article will take operation shadowless lamp as point example to explain on the development of domestic medical lighting and market capacity and so on.

A Light Analysis of LED emergency lighting products

First, where needs the medical operation shadowless lamp?

• The second grade or above Hospital (the total number of hospital beds 100-499) has the needs to purchase medical and surgical shadowless.
Some economically developed and coastal towns such as A, B grade hospitals are equipped with operating rooms and have the demands for medical surgical shadowless lamps and LED Products.

1, Medical led emergency lighting products devices are classified into:

Class I: conventional management is enough to ensure its safety, efficacy.
Class II Medical Device: safety, efficacy, should be brought under control.
Class III medical devices: for implanted in the body, to support, sustain life; potentially dangerous to the human body, its safety, efficacy of medical devices must be strictly controlled.
Medical and surgical shadowless are belong to Class II medical device management; belong to the operating room, emergency room, exam room equipment and apparatus.

2, Different hospital grades, different lighting needs
Basing on Hospitals Hierarchical Management promulgated in 1989 by the Ministry of Health, the LED factory lighting are classified into different levels; according to different functions and tasks hospitals are divided into first, second, third grades; each level is divided into A, B, C, three classes; A is the highest in every grade; add Principal class in three grade; the hospital is divided into three grades ten classes. The third grade A class is the highest level in domestic hospital, the equivalent of five-star hotel.
The third grade A class on behalf of the hospital own the biggest scale and highest skills in and the most authoritative in the rating hospital hospitals.

What is the efficient architectural solar powered led lighting?

Right now, Chinese LED lighting Products consumption accounts for almost 12% of the electricity. Lighting consumption almost accounts for 19% in the global content. Energy conservation has become a demand of the global world, many manufacturers hope to find more energy-efficient light, but energy-saving is not the only indicator. “LED is not the only lighting, the lighting also has a good purpose.” “forum held on the afternoon of April 26, 2012, fromFudan University, Professor Chen Yuming said, due to  LED develops so fast, a lot of other lighting and advantages are coated. Between the solar powered led lighting, fluorescent lamps, ceramic metal halide, incandescent, oled, and many other light sources, there isn’t exist any difference. The key is where does this light source come from.

There is no doubt that LED should be a very important and promising light source. LED luminous efficiency has been greatly improved, the CREE laboratory level has reached 254lm / W. In addition to the luminous efficiency, the entire system of LED lamps, such as luminaires, intelliegent control, power and other factores may play an important role on the application of solar powered led lighting. Currently, LED light source also has a long way to go.

The present white LED are sparkled by the blue lights and added yellow fluorescent powder, it can extend the product color index more than 90 by the red band. But compared with the sunlight, the white LED spectrum of light in the 480mm range exists little, and in a wider area, which can affect the human biological clock.

But it does not say that LED is not good. We need to address the problem and solve the problem of intermediate spectrum missing. Right now, many munufacturies remedy the spectrum missing by phosphor technology, or by UV LED, the zinc oxide as a media and other ways. “If the LED spectrum have been made up, the promotion of solar powered led lighting is not the price problem.

The price is never a problem. Once LED street light has a real large-scale mass production, a light to spend few dollars will not be a problem. The biggest problem is that you can actually meet the needs of lights. That will be the target problem which dominate the marketing.

LED light consumption only half as much as that of traditional light?(1)

In recent years, many people raise doubts about the energy saving function of LED lights. Does LED light consumption really half as much as that of traditional light? Theoretically, this can be realized: traditional light source is full-angled (half of which is useless light), while source for LED light is half-angled (none of which is useless light). However, this theory is too subjective to be used. Obviously, people who presented this theory had little acknowledge of LED applications and LED lamps.

 

In recent years, many people raise doubts about the energy saving function of LED lights. Does LED light consumption really half as much as that of traditional light?

 

Under what circumstances traditional light sources are considered as half efficient?

  1. There is no other lamp tool, like projector, during the installation. The light on the opposite side is directly emits to sky.
  2. The back of the light source is a rather high ceiling with very weak light reflection capability.
  3. The internal side of the lamp is completely black, all the light emits from the back will be absorbed totally.

 

However, in practical lighting applications, reflection lamp tools (projectors) are necessary for different purposes. In order to fully use the light, the internal of projectors will be mounted by all kinds of instruments with light reflection functions: lens reflection or diffuse reflection. Even for those filament lamps used in a very early age (with no reflection lamp outer covers or projectors), the reflection rate is as much as 70%. Most of the light would be reflected though ceilings and walls, if they had smooth surfaces. Nowadays, fluorescent lamps are widely used all over the world. This type of lights has no specialized projector, still using walls reflecting.

 

Even traditional lights have no effective projectors like LED lights does, they still can reflect most of the light emitting by light sources. However, LED lights which have been designed applying projectors with pretty high reflecting factor cannot 100% reflect the light coming out from light sources. However, it is cursory to judge that LED light consumption only half as much as that of traditional light is incorrect. It is not a problem as simple as “whether the earth is round or square?” Reflection ability is part of the optical-energy-converting efficiency of LED lights. There are many other aspects need to be considered. For example, LED street light itself has very high converting rate from electricity energy to optical energy, which contributes most of its much lower LED light consumption.