Light performance (light distribution): The optical […]
Light performance (light distribution): The optical performance of LED panel lights mainly involves the performance requirements of luminosity, spectrum and chromaticity. According to the latest industry standard "Semiconductor Light Emitting Diode Test Method", there are mainly luminescence peak wavelength, spectral radiation bandwidth, axial luminous intensity angle, luminous flux, radiant flux, luminous efficiency, chromaticity coordinates, correlated color temperature, color purity and dominant wavelength, Color rendering index and other parameters. The white light LED commonly used in LED panel lights is particularly important for color temperature, color rendering index and illuminance. It is an important indicator of the lighting atmosphere and effect, and color purity and dominant wavelength are generally not required.
The mainstream practice in the LED industry is to encapsulate LED chips to form a light source or light source module, and then distribute light when it is made into a lamp. In this way, the original traditional light source method is adopted, because the traditional light source emits light 360°. If you want to guide the light to the application side, the traditional Philips lamps are currently the best, with a light loss of 40%. The optical parameters of the lamps used by many domestic LED downstream manufacturers are actually the optical parameters of the chip or the light source, not the optical indicators of the overall lamps.
How to better improve the performance of light, the latest global technology is to do light distribution on the chip package, and export the light of the chip at one time to maintain the maximum light output, so that the light loss rate is only 5%-10%. With the continuous improvement of technology, the light loss rate will be lower and lower, and the light efficiency of the light source will be higher and higher. Equipped with such light source lamps, no need for light distribution, the relative lamp efficiency will be greatly improved, making it more widely used in functional lighting, forming a considerable market channel. Therefore, a good LED supplier is our top priority. We do not need to spend a high price to study how our LEDs are used for light distribution. We do not need to spend a lot of time and experience for engineers to use software simulation. The easiest way is Let LED white light suppliers cooperate. You know, if our engineers use software to simulate, then the necessary actions are input and output. The input is the previous data import, and the output is the simulation result. Then the previous data must be accurate and the back-end simulation can be correct.
Thermal performance (structure): The supply of LED luminous efficiency and power for lighting is one of the keys to the LED industry. At the same time, the PN junction temperature of the LED and the heat dissipation of the housing are particularly important. The greater the difference between the PN junction temperature and the lamp body temperature, the greater the thermal resistance, and the light energy is converted into heat energy and consumed in vain, and the LED is damaged in severe cases. A good structural engineer must not only consider the structure of the lamp and the thermal resistance of the LED, but also consider whether the shape of the lamp is reasonable, fashionable and novel, and of course, reliability, maintainability and practicality. To think from the perspective of the user, we must also consider the product from the perspective of the user.
Today's common technology is to use an aluminum substrate for packaging. The chip heat dissipation and light conversion efficiency of the aluminum substrate package have technical core bottlenecks. It cannot effectively control the junction temperature and stably maintain high-power light output, and the application will be because of the higher light efficiency of the chip. The larger the area of the aluminum substrate required, it will increase the cost and application volume, which is extremely inconvenient. So how to get out of this misunderstanding and create a new way is the core feature of new technology. Under the premise of maintaining low cost and passive heat dissipation, the use of high thermal conductivity media, through the brand-new device/lamp overall structure, reduces thermal resistance, lowers the PN junction junction temperature, makes the PN junction work within the allowable operating temperature, and maintains the maximum amount of photons The output, the minimum requirements are as follows:
(1) Ultra-low thermal resistance material, rapid heat dissipation overall structure technology;
(2) High thermal conductivity, anti-UV packaging technology;
(3) Apply low environmental stress structure technology;
(4) Overall thermal resistance "20K/W, junction temperature "80 degrees;
(5) The working temperature of LED light source lighting module should be controlled below 65℃.
Electrical performance (electronics): If a lighting fixture is likened to a girl, then light distribution is her connotation, structure is her appearance, and electronics is her heart. (It is always those beautiful and fashionable beauties that attract people's attention, and so are the products). A person without a heart has no life, and a lamp without electronics has no power supply. A good driving power supply can also determine the life of a product. The electronic standards and parameters are often much more complicated than the structure, and the initial research and development effort is also relatively large. The current technology trends and updates are changing with each passing day. Engineers have to spend a lot of energy to learn, absorb, decompose and apply new technologies. The pre-planning of electronic design, the mid-term implementation, and the entire process of post-forming require documentation and data formation. This is also the most cumbersome thing in design. For example: a preliminary plan for a power supply design, product introduction, standard specification basis, safety specification basis, electrical performance expectations, process requirements, raw material evaluation, test methods, etc. must form a system file.
In the field of LED driver power supply, the development path of Maoshuo Power Supply Company, as the industry leader, is full of legend. Out of a keen sense of the LED industry, Gu Yongde, the head of Moso Power, led his team to start investing in the development of LED power in 2006. Today, the world's leading technology of Moso Power has led the trend of intelligent driving of LED street lamps. It is proposed to provide LED street lamp manufacturers with the most reliable intelligent driving solutions. This is another example of leading the concept.