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The viewing angle of the LED is also a function of the LED chip type and the light splitting or scattering function of its epoxy resin shell. LEDs of different chips and packages will have different brightness values. If two LEDs have the same brightness value, the larger the luminous angle is, the greater the light output is.
The best LED on the market is 32 lumens per watt, which is twice that of tungsten filament bulbs. And people can predict that 60 lumens per watt will be emitted, and LEDs as bright as fluorescent lamps will appear in 2004.
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