High requirements for outdoor LED lighting
Outdoor lighting fixtures (tunnels, highways, traffic lights, parking lots, garages and other lighting environments) not only have the brightness of a unit luminaire more than several times that of indoor applications, the power of its driving power supply will also be several times that of indoor lighting. Safety design requirements are higher, even the setting conditions of outdoor public area lighting fixtures are mostly outdoor environments. The lamps and driving circuits must also be affected by wind, sun, rain, etc., and long-term high temperature/low temperature conversion will also test the drive The durability of circuit electronic parts and hardware, high power and harsh environment are all problems that must be overcome in the safe design of outdoor lighting.
In addition to the more functional outdoor lighting applications, another outdoor lighting application field is the use of LED lighting for decorative and situational atmosphere design applications, such as fountain lighting, pool lighting, gardens and sculptures for decorative applications Landscape auxiliary light source, the harshness of the use environment of these lamps is no less than that of LED lamps for general outdoor lighting applications. In the landscape lamps of swimming pools and fountains, LED lamps must be equipped with waterproof stainless steel barrel lamp body, and LED light-emitting elements, The drive circuit is wrapped in the stainless steel barrel lamp holder. The heat dissipation in the lamp is mainly distributed through the lamp body. In addition to the general outdoor lamp requirements, the safety design of the circuit must also be aimed at the possibility of pool water intrusion into the lamp, and strengthen the short circuit safety design of the drive circuit .
The rapid popularization of LED lamps is mainly due to the continuous optimization of the functions of the LED components used for lighting, bringing the lighting application functions closer to user needs. Among them, the application of COB (Chip On Board) packaging technology for LED components can be said to be a trend of LED lamps. The important key to practicality. COB packaging is the use of packaging technology to directly package single or multiple LED light-emitting dies on a printed circuit board (PCB). The COB packaging type and generally use surface mount (Surface Mounted Device; SMD) design components to process The design of the brackets on the lamp substrate is quite different, because the COB package can directly guide the heat generated by the LED light to the lower substrate through contact and dissipate it, and strengthen the heat dissipation treatment through the substrate, and the planar arrangement, a large number of LED components It can also form a surface light source lighting effect similar to traditional lamps.
The new generation of LED lighting fixtures can use COB technology to enable the new era of LED fixtures to achieve lighting effects closer to traditional incandescent, halogen or gas discharge lamps. At the same time, driving LED lighting fixtures only needs to be lower Electric drive can produce the lighting effect of these traditional lamps. Through the COB design of the light-emitting element module, not only the heat dissipation is enhanced (saving the need for more active heat dissipation design of the lamp), and the multi-component package can also simplify the design of the driving circuit. Degree (because only a single component needs to be driven).