Led Tube outdoor lighting as a result of more complex environment, affected by temperature, UV, humidity, rain, dust, chemical, gas and other natural conditions, the impact over time, it will cause Led Tube light fades to a serious problem. Therefore be considered final, outdoor lighting designers should consider when designing these external environmental factors on the Led Tube of outdoor lighting.
Second, the heat lamps outdoor Led Tube material selection should pay attention
Shell and radiator as a whole, to solve the heating problem of Led Tube, this approach is better, generally use aluminum or aluminum alloy, copper or copper alloys, and good thermal conductivity of other alloys. Convection cooling with air, strong winds and the heat pipe thermal cooling heat, (heat is similar to jet cooling of a heat pipe cooling, but the structure is more complicated.)
Choose what kind of cooling method, the cost of the lamps have a direct impact, should be considered, select the best product support and design programs.
Lampshade material selection is crucial, the current use of transparent plexiglass, PC materials, the traditional glass shade is transparent, what kind of election material of the shade with the design of positioning on product quality, in general, outdoor lighting The best shade is the traditional glass, which is to create long-lived, the best choice for high-end lighting. The use of transparent plastic, plexiglass and other materials to do the shade, interior lighting of the shade to do well for the outdoor life is limited, as outdoor sunlight, ultraviolet radiation, dust, chemical gases, day and night temperature changes and other factors that shorten the lamp life of aging , followed by the liquidation of pollution, could not easily clean and so reduce the impact of transparency lamp light output.
Third, Outdoor Led Tube chip packaging technology
Current domestic production of Led Tube light (mainly street) are mostly used more than 1W of Led Tube series and parallel for assembly, this approach more advanced thermal packaging of high technology Hydraulic Fittings products, is not easy to create high-quality lighting. Or is the use of 30W, 50W or more modules to be assembled, in order to achieve the required power, the Led Tube packaging materials useful in epoxy resin, useful silicone encapsulation. The difference is: less temperature epoxy resin, a long time easy to aging. Silicone encapsulated the temperature is better, should be used with attention to the selection.
The author's view is: A multi-chip package and heat sink is better overall, or multi-chip package with aluminum plate and then through the phase change materials or thermal grease and radiator to link the products made by the device thermal resistance than Led Tube Assembly the thermal resistance of the product less one to two thermal resistance, more conducive to heat dissipation. Lamps by Led Tube module, the module substrate is generally copper substrates, which joins with the external heat sink to use a good phase change materials, or good thermal grease to ensure the copper substrate in time spread to the heat outside the heat up device, such as the handling is not easy to make the heat accumulation caused by module chip temperature rise too high, the chip work of Led Tube. I believe that: multi-chip package suitable for manufacture of general lighting, modular package ideal for space limited situations Compact Led Tube light manufacturing (such as car headlights the main lighting, etc.).
Fourth, in the outdoor Led Tube lighting design of the radiator
Led Tube light radiator is a critical component, its shape, size, heat dissipation surface area must be designed to be consistent to the benefits of the radiator is too small, Led Tube Lamp temperature is too high luminous efficiency and lifetime of the radiator too large, the consumption of materials to increase product cost and more weight, the product competitiveness decline. Led Tube light design appropriate heat sink is essential. Heat sink design has the following components:
1. Clearly Led Tube light cooling power needed.
2. Design radiator with some of the parameters: specific heat of metal, metal, thermal conductivity, chip resistance, heat sink thermal resistance, ambient air thermal resistance.
3. Determine the use of scattered type (natural convection heat, strong wind cooling, heat pipe cooling, and other thermal cooling mode.) From the cost comparison: natural convection lowest cost, strong wind cooling medium, heat pipe cooling high cost of jet cooling the highest cost.
4. Determine the maximum permissible Led Tube lamp operating temperature (ambient temperature plus temperature rise permitted lamps),
5. Calculate the size of the radiator, cooling area. And to determine the shape of the radiator.
6. The radiator and Led Tube light to form a complete lighting, and power more than eight hours at room temperature 39 ??- 40 ??environment temperature of the lamp check to see if it meet the cooling requirements to test the calculation is correct, such as does not meet the conditions of use will have to recalculate and adjust the parameters.
7. Radiator and sealed to be waterproof shade, dust, shade and the heat sink to pad between the aging of the rubber mat or rubber mat, with stainless steel bolt, so that sealed waterproof, dustproof
Note the above four points, then the light of the promulgation of the latest technical specifications outdoor lighting, street lighting and urban design standards, it is essential outdoor lighting designers in the most basic Fiber Optic Terminal Box knowledge.
