Here that's not in the business refer to the ordinary consumer groups to (photovoltaic thermal) properties of the LED light emitting device is not conducted in-depth research; they have heard or are preparing to experience this wonderful characteristics of LED products, which they Learn more from the product media or network, and more ways to buy lamps or retail Taobao purchase based:

 

Mentioned here refers LED bulb LED as the light source bulb concept.

 

Why write this article cheat to guide the consumer, because the LED products are just born near the new lighting products, has its own source of previous generations unparalleled performance advantages, however, because of its performance advantage of a huge market temptation, from the beginning it has just entered the market, poor quality of LED product solutions or class imitation of LED products came into being, you do a product called LED products, I also do a product called LED products, you sell $ 50, I sell 20 yuan, we call LED lights, out of the market chaos, consumers do not know where to choose the time will give priority to price, which tends to make them buy the effect of publicity on less than they want or introduce , fail to recognize is really the purpose of the application of LED products. Plus the overwhelming utter a pass Taobao This is a shot in Taobao casually looking, we found the performance of contrast on the description of a mess even mess, what is by far the transmittance of 99% of the material is? That is, do not want anything up to 99% of the light effect, so we can not see too much even believe that some performance comparison Taobao business), knowledge and understanding of the product if you do not advance, the average consumer would really confused, are the 5W LED bulb, the price difference of $ 20, I bought a who ah!

 

Cheap is definitely not a good thing, but expensive is not necessarily superior product, you can rest assured purchase.

 

............ Here's plain as a layman to tell you how to buy rest assured that the LED lights, to facilitate easy to accept, do not speak profound theories here, try not to quote the article jargon, so this article does not too LED suitable for those who read the study had to waste your time,

 

LED bulb portion of the LED light source by the LED driving part (power), and the LED housing consisting of

 

  one. LED bulb lamp characteristics advantage

 

(Refer to the following features characteristic advantages advantage quality LED-based products can be achieved. In an example of bulb 5W)

 

--- ★ light energy that is actually, 5W bulb should be able to reach 40 watt incandescent or

 

Brightness 11W CFL

 

★ --- been so bright here that the brightness maintenance ratio, good energy LED products in continuous light 6000

 

After hours maintained more than 90% luminance brightness when a new lamp is lit immediately after 20,000 hours can be maintained above 80% of the new lamp brightness,

 

--- ★ long life quality LED bulb continuous use time is 20,000 hours or more, i.e.,

 

If you buy bulbs excellent quality, then a light bulb can be used for 10 years is not bad (this does not include the occasional accident-quality electronic products, during 2 years 100 in a bad

 

Two is normal)

 

★ ---- see clearly here that the LED color advantage is that the LED light under, we can

 

More clearly see the original color of things (dry leaves under the sodium lamp is green, LED lamp leaves are emerald green, high-quality LED lamps can make objects appear closer to the sun lighting effects) so as to help protect the eyesight, but also to let you feel fresh and clean indoor environment

 

---- ★ does not flash the LED flash is a further feature of large, LED lights can be maximized immediately after switch

 

Brightness, flashing and any instantaneous luminance variation does not appear in the work process, LED light is wide and the voltage supply, each time the mains voltage is insufficient, LED lights such as flashing or will not bring a date not act like fluorescent

 

These are the performance advantages of high-quality LED bulbs, however, if you do not buy inferior products or design

 

Reasonable product, you do not rule out that there is no bright lights within six months, the situation quickly darken the poor quality of the short period of time, or even live shell and other adverse security risks

 

  two. Difference in the price of the device

 

--- LED 1 watt LED market price of 6 yuan per month to 0.4, 1 watt LED luminous flux (brightness may be equivalent to the concept) ranging from 70 to 160 lumens lumens, that is very large performance difference , do not generally go LED inferior in brightness and low luminous flux

 

--- a drive power supply of 5W (LED product requires low voltage DC drive), if the design is excellent, constant current switching power supply according to the isolation design, in accordance with different parameters, market price of between 6 to 15 members but if done with RC buck programs, or to do with the low strength member, the lamp may be illuminated, market price can be between $ 2-4

 

--- excellent in heat dissipation housing aluminum, a housing market price of about 5 to 10-membered, if the plastic housing with a cooling solution + scientific or low quality of the aluminum-type dopant, a housing market price can be about 3 to 5 members

 

  three. Differences in performance of the device

 

Quality LED has three main characteristics,

 

1 --- jargon light flux is high, the LED current can be done flux 120 to 140 lm

 

Per watt, the finished lamp brightness can be made 80 to 100 lumens per watt (power efficiency

 

Ratio of luminous efficiency, the light housing to the loss of light)

 

Inferior flux LED is generally 70 to 90 lumens per watt, made after the finished lamp brightness can reach 45 to 65 lumens per watt, exception to this is poor LED is now also a method luminance make up, but the brightness will be a short the rapid decay time

 

2 ---- jargon is always on the lumen maintenance factor, high-quality program out of the lamp should be used

 

A year later not see the brightness has decreased significantly, poor quality LED bulb will be significantly decreased after 3 months of use,

 

3 ---- see clearly that the color LED, LED high color rendering index (Ra) of at least 65 or more can be done, we see things in the light clearly seen clearly more than the energy-saving lamp; LED is inferior color below 50, we see things in the light feel and look no different energy saving lamp, low color rendering index (Ra) of a certain extent can be judged good or bad of the light source, LED lighting is also another notable feature (color rendering light source color of the object is referred to, by comparing the color appearance of the object with the color temperature of the reference or reference light source (an incandescent lamp or light Videos))

 

---- high driving power source 4 driving the power switching power constant current drive control scheme, it is first isolated from the high-pressure low-pressure side is, in case of failure of the high voltage terminal fails, the high voltage is not directly applied on a safety hazard lamp body , high drive power using the wide input voltage, constant current output, when the grid environment fluctuations will not affect the LED lighting, regardless of how changes in load or environmental input, as long as the range of variation is allowed, always the output power is a constant current, so as not to damage the normal performance of LED, further provided with various high-quality drive power protection, once the abnormal, do not pose a security risk, troubleshooting the lamp can work normally,

 

5 Appearance cooling solution ------ here to use more words to describe it, because this involves a very important concept, the heat, the problem here is not handled properly, no matter what good things used inside, the same lighting It will then died a short time.

 

First clear two concepts:

 

Package 1 only high brightness with low optical attenuation of LED chips to high-grade quality

 

2LED only at low temperatures in order to maintain high brightness low light decay characteristics

 

The first one concept does not go into detail, most people do not understand, does not come out good or bad in appearance, it should be able to understand hang on, the two systems have to kill the concept of, we can intuitively judge good or bad, that is, Once here do not say, do better in front of all will be rejected,

 

LED chip products only work within a temperature of 80 degrees in order to ensure long life and high brightness low light failure, once the temperature rises above this temperature, LED life will decrease linearly, light attenuation increased dramatically, is the light will not light or brightness in a short time reduce

 

On led consumption per 1 watt of power, of which 80% of the electrical power is converted into heat, 15% to 20% of the electrical power into light, ie LED work will produce a large heat gain, we have to be dissipated through the housing, where but also involves cooling concept, and do not dare to speak of deep, shallow point on it,

 

1 --- require heat generated by the LED directly to the conductive metal, the metal can be passed through without air, which requires the welding of the aluminum substrate LED requires direct and close contact with the lamp housing,

 

2 --- metal had sufficient heat dissipation area by the need to heat the dispersion into the air, 1W experience recommended values are required when the LED 30 to 50 cm cooling area,

 

These two conditions are simultaneously needed, indispensable

 

3 --- This is a supplementary problem, the problem is the materials, high thermal conductivity material heat quickly, quickly heat will pass directly to the air, the most current biased P is aluminum, and the thermal conductivity of aluminum profiles superior die-cast aluminum , iron and plastic basically no good

 

This requires that we first look aluminum substrate is not directly attached to the lamp body, if we can not see before buying the aluminum plate fixed inside the case, then we look at the housing and a contact area large enough air, if not large, may be made directly on this lamp to give a negative life (the gap between the fins as large as possible, typically preferably greater than 2.5 mm)

 

Here we must conclude, and on housing

 

1 ---- If five watt light bulb, if the light outside the lamp body is a surface of aluminum or plastic housing is directly or iron, may be directly negative, do not buy, some things but not practical Attractive

 

2 ---- cost inferior shell, the inside of the LED lamp is not completely in contact with an overhead plate lamp body, we will not touch anything outside the housing temperature, which in fact, nearly very high temperature of the LED, pass out, 3W or more an LED bulb in the lamp housing 15 minutes after the lighting will feel hot (too hot nor, of course, not too hot cooling area of the housing described) If you are warm to the touch feeling of the hand rather than a hot feeling, then you Do not buy direct

 

Conclusion: how to choose a high-quality LED Bulb

 

1 ...... Do not put too much on Taobao merchants description of the product, especially in comparison with others doing the advantages of his product when some description is exaggerated or even nonsense (especially talking about LED optical and thermal properties of when many businesses has always been an outsider, out of character contrast to some extent, can be said to be in the flicker consumers, wrong to say, nonsense, nonsense, then the sky to fly, as long as it can show the so-called distinctive features of his product, what can be said dare to write), some pictures are deliberately out of the PS effect, so this comparison, we can look to see, not too letter

 

Marked on the 2 ...... see the seller's products are power, or is it power and luminous flux are marked? If only the standard power, businesses may have to pay attention and we do concept in the game, remember that we spend money on is not the power of brightness, a 5-watt bulb, 30 yuan, 5W how bright? I spend 30 yuan to buy your brightness, 30 yuan to buy a number of lumens of light, instead of 30 yuan to buy the number of watts the things I was used to lighting, so when purchasing lighting products have a certain look no luminous efficiency of this parameter: its unit is lm / W, the total flux can also be marked, the unit is the lumen (LM), if not standard, it is best not to buy the regular manufacturers out of the product impossible not to mark such an important parameter, because it is a lighting products ah! So if you do not mark, then naturally he does not hang on the subject, there is no basic standard that may leak, you do not ask why the business did not mark this, knowing that on the line, it is meaningless question,

 

At the current level of development of LED, light bulb parameters should be done for more than 80 lm / W

 

So we should be able to see either standard optical efficiency: 80 lm / W or higher

 

But for standard flux: 400 lumens or higher

 

Rated power: 5 watts of power

 

We must buy brightness, rather than buy power, power is an essential parameter, depending on the power

 

Brightness parameters under rate is the number makes sense. Here we have to note that luminous efficiency of 70 lm / W or less

 

The bulb is best not to buy, not the subject of even more do not buy, in front of the reasons mentioned, you know.

 

3 ...... see color rendering index (Ra) there is no standard, the subject of how much general Ra> 65 is appropriate. If you do not mark

 

Or the subject too low, it is best not to buy, do not get inferior LEDRa

 

4 ...... see whether the power supply is constant current drive power, whether it is the quality of vitality, this one in general use

 

Households a bit difficult, if you can, you can put the power of businesses to provide pictures sent to you in electronic related work friends, let The quality of the program and help determine the vitality of

 

5 ...... see a housing mainly depends on the cooling capacity, a look led lamp body and the lamp plate there against, two

 

According to the power determination not enough cooling area of the housing (to be noted here that only two heat dissipating surface of

 

There are more than 2mm gap between the heat dissipating surface can be considered effective heat dissipation surface, the heat dissipation is too thick to make the teeth of the radiator

 

Hand, the cooling effect is not good, because the cold air can not enter between two teeth, the teeth reach the heat dissipation purposes

 

6 ...... see the appearance, look beautiful appearance is not beautiful, the aluminum material is not, is not surface-treated fine

 

Fine quality can also be seen directly. Details of the decision attitude, attitude is the quality, the appearance of a very

 

Nice product, quality better where to go, just go up to determine the person's clothes from shoes how

 

I like to wear leather shoes double, you can expect that he would suit the value of 1000 yuan? Unless the human brain

 

The child in question

 

7 ...... look at packaging, regular factory produced products should be used in regular packaging, labels, brochures, Paul

 

Repair certificate,

 

8 ...... look at the quality, the most important, because I tell you in front of these parameters can be someone

 

What can dare to write, if the business parameters dare he wrote commitment to do that in order to illustrate his book is true, for example, you test parameters and target parameters he does not meet the grave is not free to return, as we look at the data Insurance is not necessarily the data is written up people Well, by the need to ensure the authenticity, no such guarantee, or can not buy, the first to dare to write, do not write parameter is the fear you find the goods and not the same as you find written so he usually wrote his return to power and the user side of the ball hit the Sassafras