We’ve made a sale a large number of 5730smd led today. there are a number of distinguishing characteristics by which you can identify a 5730smd led (warm white).
●Low power, less heat, saving heat costs, and cost savings.
High thermal conductivity of composites.
High current（60-150mA）
●Excellent resistant capacity
●Light source uniformly , display with wide visual angle;
Main parameters
The power of led strip
No deliver for such power supply when buy led strip. so learn more about these Knowledge point and make it full use in your light system. The most frequent of these is 0603LED strip ,1210LED strip,3528LED strip,5050LED strip. Then we made a list of some other parameters for you information, see below please:
series connection and parallel of led
The series connection have an advantage over the parallel connection on circuit design . Why is this?
We are making further investigations and will take the parallel connection of led from there . The VF(Forward Voltage)have been varied. Differences also exist between different VF of the same batch of LED. the forward Voltage changes Along with the rise of temperature and work current, so the parallel connection of LED is not recommended.
UV LED device is not working correctly for quiet analysis
ⅠThe trouble cause by supply power problem
This poles are the key components in a supply power. so the battle line is not allowed to access anti-Line. If the multimeter is used to measure DC voltage or DC carnet, we must be careful that the polarity is not reversed.
please exchange poles at once if not the direction might be wrong;
ⅡSomething is wrong with the uv led module
The uv led module need by strengthening the final inspection and testing to ensure(yet that is exactly what our QC often does. good quality of uv led strip need professional manufacturer).
if didn’t stick product religiously will get into trouble. These are common problems:
1：Iron bracket make heat conduction poor cause the temperature of plate higher, in here we suggests using a copper bracket. In experimenting we find out that the efficiency of white LED using copper brackets is higher than iron brackets, moreover, the light decay is lower about 10%.
2: Epoxy resin etiolated
3: Not compact or dense in led core and led bracket
4: when led core quality is poor, the more the loss of optical power will be
First we have to know exactly that LED is diode because belongs to transistors. so it can not be measured in register . the LED would cause a voltage drop As the white LED lights . whatever the current are . other words: the diodes conduct could bring fixed voltage drop, Unlikely to change over current.
Another method :looking at the internal resistances of LED of change with LED of current-voltage curves.
LED of knowledge points(color acronyms)We has been a LED for years,we’re going to have to do some conclusions and explore.
New some discussion and summation of the led color acronyms. as shown in the list below.
Electrical energy is so useful because it is readily converted into other useful energy.the electrical energy is so amazing . led drive power supply ‘s exactly what he’s counting on.The input power are translated into particular way(LED voltage and LED electrical current) by led power supply to drive LED . Usually, When it is used in the AC 220 V circuit (Suppose we have a input resource) . It consists of AC 、low voltage DC、high power voltage DC、low voltage high frequency . the market provide most of the constant current source . Constant current source can avoid the fluctuations of output current due to the fluctuations of input voltage, and maintain the brightness of LED. the Core components of led power supply include: Switching Controller 、MOSfet 、Feedback resistor、input filter device elect (Phase Locked Tracking filter).
The nominal voltage of lamp
The nominal voltage of lamp has a big significance, All of these lamp products have a detailed datasheet. These file all refer to a nominal voltage to indicate that lamp work voltage. the lamp will be damaged if It’s over nominal voltage. we can through the common lamp to be clear about the importance of nominal voltage.
1、Incandescent lamp
for the development of luminescent materials
the tungsten filament as a electroluminescent material .This format does have some drawbacks, however, such AS the tungsten filament which can be burn off at high voltage and big work current.
2、Fluorescent lamp
The work voltage which is more than that in effort can cause severe damage of fluorescent lamp starters. right now in status, the fluorescent lamp was break.
3、LED
The voltage and electric current of LED not exceeding specified limits. the LED structure may be impacted.
Reasons for frequent failure of LED
LED is freeze-sensitive electronic components. 20mA was the maximum value for LED work electronic current . likely to cause the LED failure in the process of using., If the steps are not followed, in some cases the led may not work. This paper analyzes the causations of LED damage,
1, The electricity supply short-circuited has been a sudden rise.
2, Then the slope rises ever more steeply as other device temperature, until it reaches an damage point.
3. There’s a short circuit somewhere in the circuit , caused these current to enhance,
4. The PCB board is taking in water, Water pipes conduct electricity.
5. The missionary hadn’t been wear antistatic clothing and shoes when assemble the led. The operation failed due to led internal damage.
The causes of failure and protection measures taken in the design, fabrication and operation of LED tank were discussed for next article.
CRI( Rendering Index) and color temperature
We studied the theory of CRI and color temperature of LED in my previous articles. but Many asked me to say that Understand correctly both relations .This article examines the relationship simply.
CRI( Rendering Index) and color temperature in test report
The popular understanding of the color temperature that the color at the yellow or in the blue The popular understanding of CRI is light object to the target image color range . Of course, the two are not entirely related. But for the Cree is concerned(high CRI are generally low color temperature),we copied the relevant data out of the datasheet.
Notes:
• Cree maintains a tolerance of ±7% on flux and power measurements, ±0.005 on chromaticity (CCx, CCy)
measurements and ±2 on CRI measurements. See the Measurements section (page 10).
• Typical CRI for Cool White (5000 K – 8300 K CCT) is 70.
• Typical CRI for Neutral White (3700 K – 5300 K CCT) is 75.
• Typical CRI for Outdoor White (4000 K – 5300 K CCT) is 70.
• Typical CRI for Warm White (2600 K – 3700 K CCT) is 80.
• Minimum CRI for 80-CRI White is 80.
• Minimum CRI for 85-CRI White is 85.
• Minimum CRI for 90-CRI White is 90.
• Flux values @ 25 °C are calculated and for reference only.
** Calculated flux values at 700 mA, 1 A and 1.5 A are for reference only.
