Precision light distribution, efficient use of white LED light
Nissan Motors launched the electric vehicle (EV) "LEAF" in December 2010 (Chinese name: Listening Wind. Figure 1). The car is initially mass-produced at an unprecedented scale in EV with an annual production capacity of 50,000 units and an annual output of 200,000 units in 2012. This model has a lot of attention, such as guiding the location of the charging facility through linkage with the communication function navigator, and thoroughly managing the lithium ion rechargeable battery for extended battery life. Among them, the standard LED headlamps are also receiving attention.
Figure 1: Nissan LEAF
It is Japan City Light Industry that is responsible for developing LED headlamps for LEAF. In order to achieve "the world's highest power-saving performance" at low cost, Shiguang Industrial has made efforts to suppress the luminescence loss of white LEDs and obtain the desired light distribution characteristics, and also adopted white LEDs. Efficient heat dissipation to ensure high luminous efficiency.
The LED headlamps of LEAF use white LEDs on the low beam light source, and the power consumption of the low beam lights is 23W for the entire headlights. This value is only about 40% of the 55-60W class halogen lamp and about 50% of the 43-45W class HID lamp. Even with the existing LED models of the Toyota Hybrid Prius, the LED headlamps (about 35W when the low beam is on, the value when the new car is released) are less power-hungry.
Use only 2 white LEDs as the light source
In the development of the LED headlamps of the city's light industry, Murakami Katsuhiro (head of the P2P3 1st project team of the Research and Development Department of the City Light Industry Development Division) emphasizes that each headlight of the LEAF uses only two white LEDs. (figure 2). The price of LEAF is 3.76 million 4,250 yen (including tax), and when the government subsidies are used, it is 2.98 million yen (including tax), and the price of EV is kept at a low level. However, the car is equipped with LED headlights at this popular price. Therefore, it is necessary to control the component cost of the LED headlight to a low level as compared with when it is equipped as an option or on a high-end model. For this reason, it is necessary to "use only two places where three white LEDs are used by other manufacturers" (Shiko Kogyo Co., Ltd.).
Figure 2: LED headlights. Each LED headlamp uses 2 white LEDs.
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