First, outdoor lighting designers must consider the outdoor LED lighting work environment LED outdoor lighting due to the more complex work environment, subject to temperature, ultraviolet light, humidity, rain, rain, sand, chemical gases and other natural conditions, over time , it will lead to serious problems of LED Light failure. Therefore, the ultimate consideration is that outdoor lighting designers should consider the impact of these external environmental factors on LED outdoor lighting fixtures when designing.
Second, outdoor LED lamps in the selection of heat-dissipating materials should pay attention to matters Shell and heat sink design as one, to solve the problem of LED heating, this method is better, generally selected aluminum or aluminum alloy, copper or copper alloy, and Other alloys with good heat conduction. The heat dissipation includes air convection heat dissipation, strong wind cooling heat dissipation, and heat pipe heat dissipation. (The jet cooling heat dissipation is also similar to heat pipe heat dissipation, but the structure is more complicated.)
What kind of heat dissipation method is selected has a direct impact on the cost of the lighting fixtures. It should be considered comprehensively, and the best solution should be chosen in conjunction with the design product.
The material design of the lampshade is also very important. At present, transparent plexiglass and PC materials are used. The traditional lampshade is a transparent glass product. The lampshade of what kind of material is selected is related to the product grade positioning of the design. Generally speaking, outdoor lamps and lanterns The lampshade is preferably a traditional glass product, which is the best choice for manufacturing long-life, high-end lamps. The use of transparent plastic, plexiglass and other materials for the lampshade, do the indoor lamp shade is better, for outdoor life is limited, because the outdoor sunlight, ultraviolet light, dust, chemical gases, day and night temperature changes and other factors make the lamp shade aging life shortened Secondly, pollution is not easy to clear and clean, so that the transparency of the lamp shade reduces the output of light.
Third, the packaging technology of outdoor LED chips At present, LED lamps (mainly street lamps) produced in China are mostly assembled using 1W LED strings and parallel connections. This method has higher thermal resistance than advanced packaging technology products and is not easy to create. High quality lamps. Or use 30W, 50W or even larger modules for assembly to achieve the required power. The packaging materials for these LEDs are encapsulated with epoxy resin and encapsulated with silicone. The difference between the two is that the epoxy resin package has a poor temperature resistance and is prone to ageing for a long time. Silicone packaging is better in temperature resistance and should be selected carefully when used.
It is better to use a multi-chip and heat sink overall package, or use an aluminum substrate multi-chip package and then connect the phase change material or the thermal grease to the heat sink, so that the thermal resistance of the product is higher than the thermal resistance of the product assembled with the LED device. Less one to two thermal resistances are more conducive to heat dissipation. The LED module lamp, the module substrate is generally a copper substrate, and it is connected to the external heat sink to use a good phase change material, or good thermal grease, to ensure that the heat on the copper substrate can be transferred to the external heat sink in time. Up, if not handled properly, it is easy to cause the temperature of the module chip to rise too high due to heat accumulation, which affects the normal operation of the LED chip. The author believes that: multi-chip package suitable for the manufacture of general lighting, modular package suitable for space limited occasions to create compact led lamps (such as car headlights, such as the main lighting).
Fourth, in the study of outdoor LED lamp radiator design research Radiator is a key component of the led lamp, its shape, size, heat sink surface area must be designed to negotiate the benefits, the radiator is too small, led lamp operating temperature is too high , affect the luminous efficiency and life, the radiator is too large, the consumption of materials will increase the cost and weight of the product, so that the product competitiveness is reduced. It is important to design a suitable LED light radiator. The radiator design has the following sections:
1. Determine the power required to dissipate the heat from the LEDs.
2. Some parameters used in the design of the radiator: specific heat of the metal, thermal conductivity of the metal, thermal resistance of the chip, heat resistance of the heat sink, and thermal resistance of the ambient air.
3. Determine the type of dispersion, (natural convection cooling, strong wind cooling, heat pipe cooling, and other cooling methods.) Comparison from the cost: natural convection cooling the lowest cost, strong cooling air, heat pipe cooling costs, jet cooling costs highest .
4. Determine the maximum allowable operating temperature of the LED luminaire (ambient temperature plus allowable temperature rise of the luminaire),
5. Calculate the volume and heat dissipation area of ​​the heat sink. And determine the shape of the heat sink.
6. Combine the heat sink and LED lamp into a complete lamp, and work on electricity for more than eight hours. Check the temperature of the lamp under the environment of room temperature 39°C--40°C to see if the cooling requirements are met to verify the calculation is correct. If not, use it. Conditions, then we need to recalculate and adjust parameters.
7. Radiator and lampshade must be sealed to prevent water and dust. Between the lampshade and radiator, there must be anti-aging rubber mat or silicone rubber mat, and be fastened with stainless steel bolts so that the seal is waterproof and dustproof. Matters, and then refer to the latest outdoor lighting technical specifications issued by China, as well as urban road lighting design standards, which is the essential basic knowledge of outdoor lighting designers.
Second, outdoor LED lamps in the selection of heat-dissipating materials should pay attention to matters Shell and heat sink design as one, to solve the problem of LED heating, this method is better, generally selected aluminum or aluminum alloy, copper or copper alloy, and Other alloys with good heat conduction. The heat dissipation includes air convection heat dissipation, strong wind cooling heat dissipation, and heat pipe heat dissipation. (The jet cooling heat dissipation is also similar to heat pipe heat dissipation, but the structure is more complicated.)
What kind of heat dissipation method is selected has a direct impact on the cost of the lighting fixtures. It should be considered comprehensively, and the best solution should be chosen in conjunction with the design product.
The material design of the lampshade is also very important. At present, transparent plexiglass and PC materials are used. The traditional lampshade is a transparent glass product. The lampshade of what kind of material is selected is related to the product grade positioning of the design. Generally speaking, outdoor lamps and lanterns The lampshade is preferably a traditional glass product, which is the best choice for manufacturing long-life, high-end lamps. The use of transparent plastic, plexiglass and other materials for the lampshade, do the indoor lamp shade is better, for outdoor life is limited, because the outdoor sunlight, ultraviolet light, dust, chemical gases, day and night temperature changes and other factors make the lamp shade aging life shortened Secondly, pollution is not easy to clear and clean, so that the transparency of the lamp shade reduces the output of light.
Third, the packaging technology of outdoor LED chips At present, LED lamps (mainly street lamps) produced in China are mostly assembled using 1W LED strings and parallel connections. This method has higher thermal resistance than advanced packaging technology products and is not easy to create. High quality lamps. Or use 30W, 50W or even larger modules for assembly to achieve the required power. The packaging materials for these LEDs are encapsulated with epoxy resin and encapsulated with silicone. The difference between the two is that the epoxy resin package has a poor temperature resistance and is prone to ageing for a long time. Silicone packaging is better in temperature resistance and should be selected carefully when used.
It is better to use a multi-chip and heat sink overall package, or use an aluminum substrate multi-chip package and then connect the phase change material or the thermal grease to the heat sink, so that the thermal resistance of the product is higher than the thermal resistance of the product assembled with the LED device. Less one to two thermal resistances are more conducive to heat dissipation. The LED module lamp, the module substrate is generally a copper substrate, and it is connected to the external heat sink to use a good phase change material, or good thermal grease, to ensure that the heat on the copper substrate can be transferred to the external heat sink in time. Up, if not handled properly, it is easy to cause the temperature of the module chip to rise too high due to heat accumulation, which affects the normal operation of the LED chip. The author believes that: multi-chip package suitable for the manufacture of general lighting, modular package suitable for space limited occasions to create compact led lamps (such as car headlights, such as the main lighting).
Fourth, in the study of outdoor LED lamp radiator design research Radiator is a key component of the led lamp, its shape, size, heat sink surface area must be designed to negotiate the benefits, the radiator is too small, led lamp operating temperature is too high , affect the luminous efficiency and life, the radiator is too large, the consumption of materials will increase the cost and weight of the product, so that the product competitiveness is reduced. It is important to design a suitable LED light radiator. The radiator design has the following sections:
1. Determine the power required to dissipate the heat from the LEDs.
2. Some parameters used in the design of the radiator: specific heat of the metal, thermal conductivity of the metal, thermal resistance of the chip, heat resistance of the heat sink, and thermal resistance of the ambient air.
3. Determine the type of dispersion, (natural convection cooling, strong wind cooling, heat pipe cooling, and other cooling methods.) Comparison from the cost: natural convection cooling the lowest cost, strong cooling air, heat pipe cooling costs, jet cooling costs highest .
4. Determine the maximum allowable operating temperature of the LED luminaire (ambient temperature plus allowable temperature rise of the luminaire),
5. Calculate the volume and heat dissipation area of ​​the heat sink. And determine the shape of the heat sink.
6. Combine the heat sink and LED lamp into a complete lamp, and work on electricity for more than eight hours. Check the temperature of the lamp under the environment of room temperature 39°C--40°C to see if the cooling requirements are met to verify the calculation is correct. If not, use it. Conditions, then we need to recalculate and adjust parameters.
7. Radiator and lampshade must be sealed to prevent water and dust. Between the lampshade and radiator, there must be anti-aging rubber mat or silicone rubber mat, and be fastened with stainless steel bolts so that the seal is waterproof and dustproof. Matters, and then refer to the latest outdoor lighting technical specifications issued by China, as well as urban road lighting design standards, which is the essential basic knowledge of outdoor lighting designers.
LED - High Power,LED - High Power Bulb,High Power LED Module,High Quality Led Light
LED Headlight LED Fog Light Co., Ltd. , http://www.nbledheadlight.com