Low-voltage power supply and high-voltage power supply of Wall lights

We know that led ground light divided into low-voltage power supply and high-voltage power supply. how to choose a led wall lights? First let’s explore advantages and disadvantage of Wall lights. it is a more accurate method for choose led wall lights.
*advantages of low-voltage power supply —led wall lights(DC)
Security and reliable：it should provide a secure input work value. the DC input value 12V/24V/36V.
Flicker-free :Led ground lights work in pure DC and flicker-free, eliminating the visual fatigue by traditional strobe light.
Small size:small size, light weight,
*disadvantages of low-voltage power supply —led wall lights(DC)
installation is not convenient: but it would be require a DC input voltage power supply.
near distance transmit: it has a faster transfer speeds and short transmission distance within limits direction.

*advantages of low-voltage power supply —led wall lights(AC)
installation convenient: which can input AC directly .there are no need a DC power supply . AC input value as 86V~250V.
universal good:the AC led ground light has the characteristic of strong matching ability, good expansibility
far transmit distance: compared with DC led ground lights, the installation wire of AC led ground lights is cost low.the wire transmission distance is very far away.
*disadvantages of low-voltage power supply —led wall lights(AC)
high voltage and are dangerous.
due to the intrinsic characteristics of AC input voltage source, its light output in all exists certain stroboscopic.

What is 5730 led?

The 5730 led is patch led. We know that this 5730 led dimension is 5.7mm*3.0mm.so we can use this led size to name this 5730 led. patch crystals is the primary point of patch led. the main product that patch crystals have been widely used in kinds of patch led.

The 5730 led is mainly used in automobile interior auxiliary lighting

LED lighting for Classrooms

In the school room with led lighting bright our light(Our classroom is lighted with electric light). and watch this chapter to understand how to choose led light correctly

1. A high quality and efficiency welding technology of classroom led undecorate is necessary. because it has good tolerance of water and not easy to fade away, excellent anti-wear performance and anti-rust property.

2. Good-quality material for light panels, ensure the excellent clarity for light guides.

3. Volume of led body is small as far as possible. Thus, it can save space.
4.Internals easily removed for field replacement.
5. Classrooms led work in flicker-free is necessary, eliminating the visual fatigue by traditional strobe light.

6. By applying hermetically sealed structure,to prevent mosquito from entering the led body. and uses cold plate technique to cooling of the working temperature of led.

led light solution
At present, led light drive solution is divide into two type: SMPS—Switching Mode Power Supply  and  AC/DC led driver.what are the characteristics of these two led light solution?
1、reliability

In the wake of developments in led wafer technology. the led light resource can reach more than 50000 hours ~ 100000 hours. but SMPS is unreliable and low in efficiency .
AC/DC led driver removes the bottleneck problem restricting the development of SMPS .

and it stability of work temperature. in the course of energy conversion, led production want to do best job in good conditions. the method can insure that led life time can reach more than 500000 hours ~ 100000 hours.

SMPS                                            IC

Integrate IC led power
Discrete components led power

2、Cost

The SMPS—Switching Mode Power Supply is complex solutions also increase the total cost of the led driver solution. AC/DC led driver is simpler to design, AC/DC led driver is the key to designing a led light solution that truly meets optimization goals.

it has advantage of low cost and high reliability to control led light solution by AC/DC led driver.

The phosphors an important effect on the led

Phosphors are key materials for the improvement of color rendering index of LED lighting, and play an important role in white LED energy-efficient lighting devices . this is mainly reason for phosphors use in led . the follow reason that efficiency of light . we are know that phosphors is an interesting alternative to yellow led chip(yellow led = blue led + phosphors). but why would led factory use phosphors? we did it because its low light-to-energy conversion efficiency and limit its large-scale ap-plication.

the customer can also design custom led style

More and more large hotels, supermarkets, warehouses or factories, public buildings, such as libraries, hospitals and schools. have gone ‘green’ and started producing so-called environmentally-friendly led products. led products is not only the environmentally-friendly andThe led can also be custom-made to suit customer own requirements. in recent years, the LED light source has gradually replaced incandescent lamp, and fluorescent lamps.new technologies emerged and is gradually replacing obsolete technology.

www.ledlightmake.com have rich experience and enthusiastic design team and strong core factory for custom led production.

changing the value of led gray level
The gray level is a very important parameter . The gray level decides that colour is the main observation point.
of course, these value are not rigid and unchanging. we can adjust the output-value with two methods as follows:
*change the led currnetly:however diffient parameter led may be, we can change its gray level through adjust led  work currently.in general, max allowable continuous working current of led is 20 mA .
most of led was nonlinear and direct proportional to its operation,apart from red led has   saturation phenomenon occurring.
*pulse-width modulation wave(PWM): methods to generate pulse-width modulation wave with single-chip microprocessor to                      adjust that value of led gray level.A point to note is that cyclical of PWM should be short,  and frequency should be high. the all of the user do not look that led trembled slightly as led working. PWM are more geared to changing the value of led gray level.

The ceiling lamp is arranged on a lamp holder on a ceiling by the lamp cap that extends out;to this end, we took a pair of ceiling lamp to make a simple dismantling.

A view of the base plate

Lens of ceiling lamp

Information of lamp PCB board

Constant currently IC

Calculating method for led required power

And up until now buying many species of led, we’ve been concerned about how many work power the led module can get. with these 0,25W、0.50W.75W、1W as exemplifications of led power calculation.

*1.480×0.25=120W，together with power dissipation, comes to around 135w, the hourly usage of 0.135 kilowatt.

*2.480×0.5=240W，together with power dissipation, comes to around 260w, the hourly usage of 0.26kilowatt.

*480×0.75=360W，together with power dissipation, comes to around 390w, the hourly usage of 0.39 kilowatt.

*480×1=480w，together with power dissipation, comes to around 510w, the hourly usage of 0.51kilowatt.

led factors method

A typical led application of three elements.
1、led  Cleaning ,
We are need to handle these clean led with chemical. because Some chemical may have a bad reaction to those led and the chemical may cause slight discoloration, they include trichloroethylene (trichloroethylene) and acetone.dipping and ethanol alcohol are ideal cleaning methods.and don’t exceed 3 second under common temperature.

2、led over-current protection
Another considerations for using led:limiting the use of one type over-current protection circuit to limit output current,and by changing the size of the current sampling resistor to regulate the size of current-limiting value.

The calculating formulas are gived:R=（VCC-VF）/IF
VCC as power voltage, VF as work voltage of led , IF as work currently of led

3、welding conditionas
Soldering condition has great effect on the performance of led module.
Soldering by soldering iron:the temperature of soldering iron no more than 300℃，the welding time no more than three second, The surface of led should be at least two millimeter higher than the position of the welding location.

Wave soldering: compatible with lead free soldering.the temperature of soldering iron no more than 260℃，
the welding time no more than five second, The surface of led should be at least two millimeter higher than the position of the dip soldering location.