4 Key Points in Design LED Outdoor Lighting
LED Outdoor lighting design should comply with the latest outdoor lighting technical specifications, as well as the city lighting design standard.Movie Carol (2015)
1, Working Environment
The working environment of outdoor lighting is tough, like wind, rain, sunshine, the ultraviolet radiation, the temperature changes, dust, chemical gas influence, and year by year aging treatment by nature. We should fully consider the impact of these factors before design.
2, Structure Design
Heat sink is generally chose aluminum or aluminum alloy, copper or copper alloys, and other alloy with good heat conduction. The cooling way like cooling air convection heat, wind cooling heat and heat pipe cooling, (jet cooling heat dissipation is similar to a heat pipe cooling, but more complicated structure) Choose what kind of cooling mode has a direct impact on the cost of the light, should be more considered.
Now we use transparent organic glass, PC material, etc., traditional chimney is transparent glass products. The best choice for chimney of outdoor lighting is traditional glass products, it is the best choice making the long life and high-grade lighting. The transparent plastic, organic glass, etc materials do chimney, it’s better to do the chimney of indoor lighting. If used it for outdoor, the life is limited. Due to the outdoor sunlight, ultraviolet ray, sand and dust, chemical gases, day and night temperature change and other factors. At the same time the pollution is not easy to settle accounts clean, make lampshade transparency reduced light output.
3, LED Chip Package
Current LED outdoor lighting (mainly street lamp) are mostly use 1 w LED more series and parallel for assembly, this kind of method thermal resistance advanced packaging technology products is high, not easy to create high quality lighting. And another way is to use 30 w, 50w even greater module for assembly, in order to achieve the required power, these LED encapsulation materials useful epoxy resin encapsulation, useful silica gel encapsulated. The difference is: epoxy resin encapsulation heat resistance is poorer, time is long aging. Silica gel encapsulation is heat resistance is good.
More chips and radiator whole package is better, or use the aluminum plate more chip package again through the phase change material or heat silicone grease and radiator connected, make product thermal resistance than using LED device assembly product thermal resistance is less one or two word thermal resistance, and will be more suitable for heat dissipation. The LED module lighting, module base plate is commonly copper base plate, it to the radiator of the connection to use good phase change material, or good heat dissipation silicone grease, guarantee the copper base plate of heat can promptly to the radiator up, such as processing is not easy to make heat accumulation cause module chip is too hot, influence the normal work of the LED chip. The author thinks that: chip packages suitable for manufacturing general lighting lighting, module encapsulation limited space for the occasion of manufacturing compact led lighting (such as car main lighting head lamp, etc.).
4, Design of Radiator
The radiator is one of the crucial parts of LED lighting, its shape, volume, heat dissipation surface area are designed to address the benefits. If radiator is too small, LED lighting working temperature is too high, influence the luminous efficiency and life. If radiator is too large, the consumable material increase product cost and weight, make the product competition force down. Design the suitable LED lighting radiator design has the following 7 parts:
1. Understand the need of power for LED lighting cooling.
2. Some parameters when designing radiator: metal heat, the thermal conductivity of metal, chip thermal resistance, thermal resistance, the surrounding environment air thermal resistance, etc.
3. Determine the type of the heat dissipation, (natural convection, wind cooling, heat pipe cooling, and other cooling mode. From the cost comparison: natural convection cost minimum, wind cooling medium, heat pipe cooling cost is higher, jet refrigeration highest cost.
4. Define LED lighting licensing the highest working temperature (environment temperature and lighting licensing temperature rise)
5. Calculating the volume of radiator, radiator area. And make sure the shape of the radiator.
6. The radiator and LED lighting sets synthetic complete lighting, and energizing work more than eight hours at room temperature, 39 ℃ – and ℃ environment check the temperature of the lighting, look to whether meet the cooling requirement, in order to check calculation is correct, such as do not satisfy the conditions of use, should recount and adjusting parameters.
7. The radiator and lamp shade seal to do waterproof, dustproof, chimney and the radiator to pad anti-aging rubber pad or silicone rubber pad, with stainless steel bolts and do seal waterproof, dustproof.Share