The improvement of the luminous efficiency of the white LED used in LED lighting is very obvious, and the progress in the recent one to two years is particularly remarkable. Although the value exceeds 100 lm/W, the fluorescent lamp is still not exceeded in terms of LED lighting fixtures. When a lighting fixture is assembled using a white LED, the overall efficiency (comprehensive efficiency) of the lighting fixture is about the illumination of the white LED under the influence of the power conversion loss of the power supply circuit, the decrease in the luminous efficiency caused by the temperature rise and the input of the large current, and the optical loss in the appliance. 50 to 70% efficiency, even with the latest white LED can only reach about 80%. The luminous efficiency will continue to improve in the future. LED lighting fixtures with integrated efficiency beyond fluorescent lamps will be available from 2010 to 2015. At that time, LEDs will truly become the illumination of efficiency No.1.
The suggested retail price per unit brightness of LED lighting fixtures released in June 2009 is about 20 yen/lm, which is about 4 times that of lighting fixtures using fluorescent lamps. The price difference is large, but by 2015, the price will be reduced to Slightly higher than the level of fluorescent lamps, the overall efficiency will also reach 120 ~ 130lm / W, significantly surpassing fluorescent lamps. By then, the willingness of consumers to adopt LED lighting will increase. Even so, the price of fluorescent lighting fixtures is still lower than that of LED lighting fixtures, so fluorescent lighting fixtures will not disappear from the market.
When Toshiba Lighting Technology released LED bulbs in 2006, the overall luminous efficiency of LED bulbs was only 18 lm/W, which could only replace decorative bulbs. After that, the efficiency of LED bulbs gradually increased to 45lm/W in 2007 and 68lm/W in 2008, which can be used as a bulb for spotlighting. In 2008, 82lm/W and 93lm/W in October reached Replace the level of light bulbs for general lighting.
In 2008, Sharp entered the LED lighting market with a low price strategy. In June 2009, the company released a brand-new LED bulb with a market price of about 4,000 yen, which is only half of the competitive products. Immediately after the launch, it launched a strong shock wave in the market. Sharp's low-priced products forced Toshiba Lighting Technology to launch LED bulbs with a brightness equivalent to 60W incandescent lamps in July 2009. The manufacturer's suggested retail price is about 5,000 yen, and the market price is about 4,000 yen. Compared with similar products launched by Toshiba four months ago, the price has dropped by 50% (see Figure 1 and Table 1).
Figure 1: LED lamp price comparison
Table 1: The price drop of LED lamps is obviously in the LED lighting market, and other Japanese companies are also closely followed. In July 2009, Ecorica significantly lowered the price of LED bulbs launched by the company in April of the same year, down from the original 7,200 yen to 3,780 yen; IRISOHYAMA also launched a product with a price of 3,980 yen. NEC Lighting released an LED bulb in August 2009. The press release stated that its price has strong market competitiveness. In late October, Panasonic also launched 10 EVERLEDS series LED bulbs at the same price as competing products.
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