LED bulbs have a longer life than bulb-type fluorescent lamps. Long-life bulb-type fluorescent lamps are only about 12,000 to 13,000 hours, and most LED bulbs have a lifespan of 40,000 hours. The disadvantage of the bulb-type fluorescent lamp is that it cannot be turned on instantaneously and the brightness is low when it is turned on, and the LED bulb does not have these disadvantages. The overall efficiency of the LED bulb (including the overall efficiency of the power supply circuit), the bulb color product is about 50.60 lm / W, the daylight color product is about 70.90 lm / W (all Japanese manufacturers' values), and the bulb type fluorescent lamp quite.
However, the LED bulb has a problem that the light irradiation range is small. Incandescent bulbs have an illumination range of about 300 degrees, bulb-type fluorescent lamps are about 260 degrees, and ordinary LED bulbs are only about 120 degrees. Therefore, a lighting fixture that needs to illuminate the side direction in addition to being straight down is not suitable for use with an LED bulb. LED bulb manufacturers solve the above problems by using a reflector that changes the direction of light illumination, or by increasing the light diffusibility of the lampshade that covers the light-irradiated surface, or by stereoscopically arranging LEDs. Panasonic's products, which went on sale in March 2011, have expanded the range to about 300 degrees, and Toshiba Lighting Technology's products, which are scheduled to go on sale in April 2011, have expanded to about 260 degrees.
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