Compared with conventional light sources that first convert electrical energy into heat, and then into light, LEDs (Light Emitting Diodes) convert electrical energy directly into light, delivering efficient light generation with little-wasted electricity.

LEDs are a type of semiconductor called "Light Emitting Diode". White LEDs, which have achieved practical realization through the use of high-brightness blue LEDs developed in 1993 based on Gallium Nitride, are attracting increased attention as a 4th type of light source.

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Combining the 3 primary colors will result in white light. Generally this method isn't used for lighting, but for full-color LED devices.

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SpectrumLED

LEDs (Light Emitting Diodes) are semiconductor light sources that combine a P-type semiconductor (larger hole concentration) with an N-type semiconductor (larger electron concentration). Applying a sufficient forward voltage will cause the electrons and holes to recombine at the P-N junction, releasing energy in the form of light.

Methods that enhance contrast include differential interference contrast (DIC), polarized light, phase contrast, Hoffman modulation contrast, and darkfield ...

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Spectrum Lighting

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Combining a blue LED with yellow phosphor, which is a complementary color, will yield white light. This method is easier than other solutions and provides high efficiency, making it the most popular choice on the market.

Two specifications for wavelength are used to indicate color: λP (Peak Wavelength) and λD (Dominant Wavelength), with λD corresponding to the color actually seen by the human eye.

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The LED color (emission wavelength) will change depending on materials used. This makes it possible to customize the color to meet certain wavelength specifications required for applications that use traditional bulbs as light sources (for which standards exist), such as traffic lights and automotive lamps.

ROHM's lineup of Light Emitting Diodes includes side emitting type , rear mount type and lamp type in addition to the standard SMD types.

As such a band pass filter passes a certain frequency range while blocking others. In electronics, an active band pass filter circuit is known as second order ...

Two types of LEDs are available, a lamp type (leaded) and a chip type (surface mount). Users can select the ideal type based on set requirements.