The performance and efficiency of lighting technology continues to exceed traditional lighting technologies, and the new technology is widely used. However, if we only replace the traditional technology with static white LEDs, it is difficult to fully realize the full potential of solid-state lighting technology, and we cannot fully realize the characteristics of the products. With the support of smart drives, LED lighting fixtures can not only replace white lighting, but also achieve new functions that are difficult to achieve with traditional lighting techniques.
Everyone knows: "All colors contain white." Depending on the correlated color temperature (CCT), there are different white tones, from warm white (such as incandescent light) to cool white (such as the light of many early LEDs and power LEDs). These two tonal values ​​range from 2700 to More than 6000K. If we use traditional technology, we can only add the intelligent function of "dimming" white light. If solid-state lighting technology is used, designers can get new features, such as adjusting the white color temperature and changing the environment.
The benefits of this new feature include increased work unit efficiency, making the retail environment more attractive to customers, increasing passenger traffic and creating a more welcoming lighting welcome in the hospitality industry. In addition, we can change the lighting effect in the retail environment according to different seasons, products, different time of day, etc., so as to promote the sales work without major renovation of the shop. Adjustable brightness is one of the characteristics of solid-state lighting technology. Of course, solid-state lighting has the advantages of energy saving, cost reduction, and extended equipment working time. These advantages have promoted the wide application of LED technology in the lighting market.
Before improving functionality, the first priority is to ensure proper lighting. In order to speed up the promotion, we should follow the traditional lighting technology specifications to ensure that the lighting effects of the new technology can meet the expectations of lighting designers, architects and end users. Only the technology that provides the right lighting and the flexibility to add intelligent features while ensuring lower business costs can revolutionize the lighting market. Performance (light intensity), quality (color temperature and color rendering), and illumination (beam angle and luminous intensity) are important parameters to consider. Color rendering is usually measured by the Color Rendering Index (CRI) standard in the IEC specification, which reflects the ability to accurately replicate lighting colors.
For example, a red car will appear brown under low pressure sodium light, which has an amber hue and a low CRI. End users want to be able to extend the life of the equipment through LED lighting technology, reducing energy consumption and maintenance costs, but if the new lighting technology does not meet the lighting quality requirements, then this technology will not be considered at all. Only when we have achieved the performance requirements for lighting effects can we turn to how to enhance functionality.
In order to achieve absolute control over the lighting effect, it is necessary to solve the problem of consistency. When using controllable solid-state lighting fixtures, we must always consider the issue of color consistency, and think about the differences in performance, including the differences between different lamps over time, temperature and set points. Although there are corresponding technologies to solve the above problems, the overall system development still poses challenges to the lighting industry. The modular or system level implementations described herein help to resolve technical issues. LED systems with appropriate power and control technologies should be a useful complement and complement to current technology, and should not conflict with existing technologies, and do not necessarily completely replace other technologies. Only in this way can they accelerate the promotion of new technologies.
Not only limited to the light source problem, but also to replace the small halogen lamp, the luminous flux of the xenon source should be between 400 and 1000 Lm. Despite the significant improvement in LED performance, high-throughput density sources that achieve these properties are rare. The existing single-chip LEDs have a luminous flux of more than 100 Lm, but few LEDs that can achieve a halogen light flux equivalent to 20W, 35W or 50W. We can combine some low-performance LEDs, but this can cause problems with light control. The generation of light is a problem, and controlling light to achieve optimal lighting is another problem. We should design a uniform source that meets the required luminous flux, which helps simplify light design and increase bulb efficiency.
Thermal management is another important issue that cannot be ignored in any high-power solid-state lighting application. The heat generated by the LED light source must be properly controlled to ensure that the device achieves a sufficiently long service life under certain operating conditions. In the case of LED miniaturized packages, heat dissipation issues can be difficult to solve, but by minimizing thermal resistance, it helps to alleviate system-wide problems.
The basic problem with designing adjustable white light is to support multiple color channels that can be individually controlled and mixed. Ensuring the consistency of the beam color without color edges or shadows is a fairly complicated task. We can improve color mixing by reducing the size of the LED or LED system's light source.
One solution is to design multi-chip LEDs to position different colors as accurately as possible to reduce the mixing distance. Although a variety of multi-chip packaging solutions are available on the market, there are not many packaging solutions that support high luminous flux density and color mixing. Most multi-chip packages have low luminous flux densities due to low drive current limitations. In addition, designers can use multiple discrete high-throughput sources, but this increases the size and color mixing of the source.
Although the comprehensive requirements of luminous flux density, dimming, color mixing and thermal management are not unsolvable problems, they do pose serious challenges for LED manufacturers. However, we should address these issues within the LEDs, which helps simplify the problems faced by OEMs and system integrators.
We have developed multi-chip high-power LEDs as a light source for adjustable "white spots", which reduces color mixing problems and supports miniaturized point-light source lighting applications. Compared to traditional power LED and array assembly, this 10-15W package solution not only significantly increases the optical output power, but also greatly improves the luminous flux density. This LED is optimized for thermal performance and reliability to increase drive current and further improve luminous flux density. The optimized combination of materials, packaging, and assembly and die bonding processes enables better thermal performance to improve the available lighting in different applications.
Adjustable LED lighting systems typically use red, green, and blue monochromatic LEDs that are mixed to produce white light, also known as RGB technology. RGB technology can support rich colors and adjustable white light, but the CRI value is quite low. The color rendering CRI values ​​that such systems can support are typically between 40 and 60, depending on the target color temperature. Internal lighting typically requires CRI values ​​above 80, and higher CRI values ​​are required in certain environments such as retail and museums. Therefore, this light can be fully applied to signal or color-washing applications, but is not suitable for use as an adjustable white light source for indoor lighting.
One possible way to increase the CRI value is to increase the color component. By adding amber to the RGBA system, we can greatly improve the CRI value while ensuring the color point adjustability. In addition, we can still achieve extremely high color flexibility, but more important for indoor lighting, we can move the white point on the black body line, and at the same time make the CRI value close to 90, which achieves better color. Render effects and produce high quality white light.
We can combine the above product factors to get better performance results. For example, a 10W RGBA transmitter (see Figure 1) has been introduced that enables high luminous flux density, color control and mixing, and its package is optimized for thermal performance and high reliability.
With this type of LED, we can develop a bulb that meets the proper illumination and quality, and also supports white point adjustment to improve color rendering. The product package shown in Figure 1 is 7mm × 7mm, the continuous current of a single chip can be as high as 1000mA, and the power consumption is only 10W when the luminous flux is 350Lm.![]()
Figure 1 10W adjustable white light products in an independently addressable multi-chip package
Multicolor LED Transmitter Introduction Multicolor LED emitters also require intelligent and integrated controllers for the following reasons:
![]()
Figure 2 Comparison of spectral energy distribution
Multi-channel drivers: High quality CRI (above 90) will require multiple types of LEDs for a given color temperature. CRI is a function of the spectral energy distribution (SPD) of a light source. SPD refers to the amount of radiation from a source at a given wavelength (frequency). Incandescent lamps with the best CRI values ​​(97 or more) have a shorter working life (750 to 2,500 hours) and lower efficiency (US Department of Energy data is 10 to 17 Lm/W). Figure 2 shows the comparison of the SPD curve of an incandescent lamp with the RGB source curve.
Obviously, the RGB source itself is not sufficient to support higher CRI. Designers need to add more color channels to fill the band so that they get a curve close to incandescent lamps. Therefore, the device must use a minimum of 4 channels of driver to drive red, green, blue, and amber or a combination of red, green, amber, and natural white light. This controller can be programmed at the factory manufacturing stage to obtain the correct u, v element values, or dynamically programmed via a communication link.
EMI Control: High-brightness (HB) LED luminaires generate high levels of electromagnetic interference (EMI) due to high-speed switching regulators, which should be controlled through special design techniques. We can use an intensity modulation technique that relies on random processing to generate a modulated output that is less noisy and easier to use from an EMI/EMC perspective by using an output function that does not contain dominant periodic components generated by a pseudo-random counter.
Compensation: LED design requires a series of complex calculations to achieve consistent color. The two biggest problems facing high-brightness LED engineers today are how to solve different LED performance specifications based on production codes, as well as performance degradation of LEDs at different temperatures (such as luminous flux output and wavelength). LED luminaires require intelligent drivers to predict color and CRI consistency at different times and temperatures through predictive methods. For some applications, the drive should also be able to accept real-time feedback data on color and temperature to ensure the performance of the fixture.
Dimming: LED luminaires should be easy to dim, their resolution should support darkness, and flicker at low brightness should be avoided.![]()
Figure 3: LED-specific development control software such as PSoCExpress from Cypress Semiconductor
To help developers solve multiple LED channels and complex color design and management issues, some companies have introduced hardware that can drive multiple LEDs and software designed to simplify LED development and control, as shown in Figure 3.
By driving multiple channels from a single device (16 for Cypress Semiconductor's EZ-Color controller), we can significantly reduce the number of controllers required for large designs, reducing design complexity and power Consumption, and save board space.
In addition, we offer direct-to-use software drivers that significantly reduce the low-frequency flicker and EMI emissions that are common in HBLED designs, including architectural lighting, general-purpose signage, rechargeable flashlights, entertainment lighting, and vehicle emergency lights. The integrated development environment also simplifies design with embedded visual design tools, so even inexperienced engineers can easily select special colors for selected LEDs.
Conclusion
LED technology and control technology continue to grow rapidly, and new LEDs open up the possibility of better lighting and ensure the desired quality of lighting. Although the work of developing the above lighting system is very complicated, manufacturers are working hard to meet the challenge to accelerate technology promotion. At present, through the combination of high-power multi-chip LEDs and LED-specific control software from LedEngin and other manufacturers, we can introduce high-performance, high-quality dimmable lighting fixtures to ensure that the lighting performance is no less than the traditional halogen light source.
Everyone knows: "All colors contain white." Depending on the correlated color temperature (CCT), there are different white tones, from warm white (such as incandescent light) to cool white (such as the light of many early LEDs and power LEDs). These two tonal values ​​range from 2700 to More than 6000K. If we use traditional technology, we can only add the intelligent function of "dimming" white light. If solid-state lighting technology is used, designers can get new features, such as adjusting the white color temperature and changing the environment.
The benefits of this new feature include increased work unit efficiency, making the retail environment more attractive to customers, increasing passenger traffic and creating a more welcoming lighting welcome in the hospitality industry. In addition, we can change the lighting effect in the retail environment according to different seasons, products, different time of day, etc., so as to promote the sales work without major renovation of the shop. Adjustable brightness is one of the characteristics of solid-state lighting technology. Of course, solid-state lighting has the advantages of energy saving, cost reduction, and extended equipment working time. These advantages have promoted the wide application of LED technology in the lighting market.
Before improving functionality, the first priority is to ensure proper lighting. In order to speed up the promotion, we should follow the traditional lighting technology specifications to ensure that the lighting effects of the new technology can meet the expectations of lighting designers, architects and end users. Only the technology that provides the right lighting and the flexibility to add intelligent features while ensuring lower business costs can revolutionize the lighting market. Performance (light intensity), quality (color temperature and color rendering), and illumination (beam angle and luminous intensity) are important parameters to consider. Color rendering is usually measured by the Color Rendering Index (CRI) standard in the IEC specification, which reflects the ability to accurately replicate lighting colors.
For example, a red car will appear brown under low pressure sodium light, which has an amber hue and a low CRI. End users want to be able to extend the life of the equipment through LED lighting technology, reducing energy consumption and maintenance costs, but if the new lighting technology does not meet the lighting quality requirements, then this technology will not be considered at all. Only when we have achieved the performance requirements for lighting effects can we turn to how to enhance functionality.
In order to achieve absolute control over the lighting effect, it is necessary to solve the problem of consistency. When using controllable solid-state lighting fixtures, we must always consider the issue of color consistency, and think about the differences in performance, including the differences between different lamps over time, temperature and set points. Although there are corresponding technologies to solve the above problems, the overall system development still poses challenges to the lighting industry. The modular or system level implementations described herein help to resolve technical issues. LED systems with appropriate power and control technologies should be a useful complement and complement to current technology, and should not conflict with existing technologies, and do not necessarily completely replace other technologies. Only in this way can they accelerate the promotion of new technologies.
Not only limited to the light source problem, but also to replace the small halogen lamp, the luminous flux of the xenon source should be between 400 and 1000 Lm. Despite the significant improvement in LED performance, high-throughput density sources that achieve these properties are rare. The existing single-chip LEDs have a luminous flux of more than 100 Lm, but few LEDs that can achieve a halogen light flux equivalent to 20W, 35W or 50W. We can combine some low-performance LEDs, but this can cause problems with light control. The generation of light is a problem, and controlling light to achieve optimal lighting is another problem. We should design a uniform source that meets the required luminous flux, which helps simplify light design and increase bulb efficiency.
Thermal management is another important issue that cannot be ignored in any high-power solid-state lighting application. The heat generated by the LED light source must be properly controlled to ensure that the device achieves a sufficiently long service life under certain operating conditions. In the case of LED miniaturized packages, heat dissipation issues can be difficult to solve, but by minimizing thermal resistance, it helps to alleviate system-wide problems.
The basic problem with designing adjustable white light is to support multiple color channels that can be individually controlled and mixed. Ensuring the consistency of the beam color without color edges or shadows is a fairly complicated task. We can improve color mixing by reducing the size of the LED or LED system's light source.
One solution is to design multi-chip LEDs to position different colors as accurately as possible to reduce the mixing distance. Although a variety of multi-chip packaging solutions are available on the market, there are not many packaging solutions that support high luminous flux density and color mixing. Most multi-chip packages have low luminous flux densities due to low drive current limitations. In addition, designers can use multiple discrete high-throughput sources, but this increases the size and color mixing of the source.
Although the comprehensive requirements of luminous flux density, dimming, color mixing and thermal management are not unsolvable problems, they do pose serious challenges for LED manufacturers. However, we should address these issues within the LEDs, which helps simplify the problems faced by OEMs and system integrators.
We have developed multi-chip high-power LEDs as a light source for adjustable "white spots", which reduces color mixing problems and supports miniaturized point-light source lighting applications. Compared to traditional power LED and array assembly, this 10-15W package solution not only significantly increases the optical output power, but also greatly improves the luminous flux density. This LED is optimized for thermal performance and reliability to increase drive current and further improve luminous flux density. The optimized combination of materials, packaging, and assembly and die bonding processes enables better thermal performance to improve the available lighting in different applications.
Adjustable LED lighting systems typically use red, green, and blue monochromatic LEDs that are mixed to produce white light, also known as RGB technology. RGB technology can support rich colors and adjustable white light, but the CRI value is quite low. The color rendering CRI values ​​that such systems can support are typically between 40 and 60, depending on the target color temperature. Internal lighting typically requires CRI values ​​above 80, and higher CRI values ​​are required in certain environments such as retail and museums. Therefore, this light can be fully applied to signal or color-washing applications, but is not suitable for use as an adjustable white light source for indoor lighting.
One possible way to increase the CRI value is to increase the color component. By adding amber to the RGBA system, we can greatly improve the CRI value while ensuring the color point adjustability. In addition, we can still achieve extremely high color flexibility, but more important for indoor lighting, we can move the white point on the black body line, and at the same time make the CRI value close to 90, which achieves better color. Render effects and produce high quality white light.
We can combine the above product factors to get better performance results. For example, a 10W RGBA transmitter (see Figure 1) has been introduced that enables high luminous flux density, color control and mixing, and its package is optimized for thermal performance and high reliability.
With this type of LED, we can develop a bulb that meets the proper illumination and quality, and also supports white point adjustment to improve color rendering. The product package shown in Figure 1 is 7mm × 7mm, the continuous current of a single chip can be as high as 1000mA, and the power consumption is only 10W when the luminous flux is 350Lm.
Figure 1 10W adjustable white light products in an independently addressable multi-chip package
Multicolor LED Transmitter Introduction Multicolor LED emitters also require intelligent and integrated controllers for the following reasons:
Figure 2 Comparison of spectral energy distribution
Multi-channel drivers: High quality CRI (above 90) will require multiple types of LEDs for a given color temperature. CRI is a function of the spectral energy distribution (SPD) of a light source. SPD refers to the amount of radiation from a source at a given wavelength (frequency). Incandescent lamps with the best CRI values ​​(97 or more) have a shorter working life (750 to 2,500 hours) and lower efficiency (US Department of Energy data is 10 to 17 Lm/W). Figure 2 shows the comparison of the SPD curve of an incandescent lamp with the RGB source curve.
Obviously, the RGB source itself is not sufficient to support higher CRI. Designers need to add more color channels to fill the band so that they get a curve close to incandescent lamps. Therefore, the device must use a minimum of 4 channels of driver to drive red, green, blue, and amber or a combination of red, green, amber, and natural white light. This controller can be programmed at the factory manufacturing stage to obtain the correct u, v element values, or dynamically programmed via a communication link.
EMI Control: High-brightness (HB) LED luminaires generate high levels of electromagnetic interference (EMI) due to high-speed switching regulators, which should be controlled through special design techniques. We can use an intensity modulation technique that relies on random processing to generate a modulated output that is less noisy and easier to use from an EMI/EMC perspective by using an output function that does not contain dominant periodic components generated by a pseudo-random counter.
Compensation: LED design requires a series of complex calculations to achieve consistent color. The two biggest problems facing high-brightness LED engineers today are how to solve different LED performance specifications based on production codes, as well as performance degradation of LEDs at different temperatures (such as luminous flux output and wavelength). LED luminaires require intelligent drivers to predict color and CRI consistency at different times and temperatures through predictive methods. For some applications, the drive should also be able to accept real-time feedback data on color and temperature to ensure the performance of the fixture.
Dimming: LED luminaires should be easy to dim, their resolution should support darkness, and flicker at low brightness should be avoided.
Figure 3: LED-specific development control software such as PSoCExpress from Cypress Semiconductor
To help developers solve multiple LED channels and complex color design and management issues, some companies have introduced hardware that can drive multiple LEDs and software designed to simplify LED development and control, as shown in Figure 3.
By driving multiple channels from a single device (16 for Cypress Semiconductor's EZ-Color controller), we can significantly reduce the number of controllers required for large designs, reducing design complexity and power Consumption, and save board space.
In addition, we offer direct-to-use software drivers that significantly reduce the low-frequency flicker and EMI emissions that are common in HBLED designs, including architectural lighting, general-purpose signage, rechargeable flashlights, entertainment lighting, and vehicle emergency lights. The integrated development environment also simplifies design with embedded visual design tools, so even inexperienced engineers can easily select special colors for selected LEDs.
Conclusion
LED technology and control technology continue to grow rapidly, and new LEDs open up the possibility of better lighting and ensure the desired quality of lighting. Although the work of developing the above lighting system is very complicated, manufacturers are working hard to meet the challenge to accelerate technology promotion. At present, through the combination of high-power multi-chip LEDs and LED-specific control software from LedEngin and other manufacturers, we can introduce high-performance, high-quality dimmable lighting fixtures to ensure that the lighting performance is no less than the traditional halogen light source.
DMX512 Digital LED Strip is a programmable led strip, be controlled by the international standard DMX512 protocol, which is addressable and programmable
by using the external drive chip DMX512.Compatible with and extend DMX512 (1990) signal protocol, the control mode is differential parallel,
built-in 485 decoding module, strong anti-interference ability, low-voltage DC24V,very safer for users.
Supports the operation mode of first installing and writing code later, and can realize any animation effect of the product through controller programming.
Suitable for large engineering projects.
DMX512 Digital LED Strip
High CRI LED Strip,Outdoor LED Strip Light,DMX RGB LED Strip,DMX512 Digital LED Strip
SHEN ZHEN SEL LIGHTING CO.,LTD , http://www.sellighting.com