Key technologies of LED flat lamp: Optical performance […]
Key technologies of LED flat lamp:
Optical performance (light distribution): the optical performance of LED flat lamp mainly involves the performance requirements of luminosity, spectrum and chroma. According to the new industry standard "semiconductor light emitting diode test method", the main parameters are light peak wavelength, spectral radiation bandwidth, axial light intensity angle, luminous flux, radiation flux, luminous efficiency, chromatic coordinates, relevant color temperature, color purity and main wavelength, color rendering index, etc.
White LED, which is commonly used in LED flat lamp, is particularly important in color temperature, color rendering index and illuminance. It is an important indicator of lighting atmosphere and effect, while the color purity and main wavelength are generally not required.
In the LED industry, the mainstream method is that after the LED chip is packaged to form a light source or light source module, light distribution is carried out when the LED chip is made into a lamp. In this way, the original traditional light source method is used, because the traditional light source is 360 ° light. If we want to guide the light to the application end, the current Philips traditional lamps do a good one, and the light loss also reaches 40%. However, the optical parameters applied by many domestic LED downstream manufacturers are actually the optical parameters of chips or light sources, rather than the optical parameters of the overall lamps.
How to improve the optical performance better, the global new technology is to distribute the light on the chip package, guide the chip's light once, maintain the large angle optical output, so the optical 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. It is also equipped with such light source lamps and lanterns without light distribution. The relative efficiency of lamps and lanterns will be greatly improved, making them more widely used in functional lighting, forming a considerable market channel. Therefore, a good led supplier is our top priority. We don't need to spend a lot of time and experience to study how to match our LEDs. The simplest way is to let the white LED supplier cooperate. You know, if our engineers use software to simulate, the necessary actions are input and output. The input is the data import in the early stage, and the output is the simulation result. Then the data in the early stage must be accurate and the simulation in the back end can be correct.
Thermal performance (structure): the lighting efficiency and power supply of LED is one of the key points of LED industry. At the same time, the PN junction temperature and shell heat dissipation of LED are particularly important.
The greater the difference between PN junction temperature and lamp body temperature is, the greater the thermal resistance will be, and then the light energy will be converted into heat energy, which will be consumed in vain. In serious cases, the LED will be damaged. A good structural engineer should 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, as well as reliability, maintainability and practicability. He should not only think from the perspective of the designer, but also consider the product from the perspective of the user.