It is my understanding that most LEDs are inherently blue, but they add phosphors that mask the appearance of that blue light, making it appear white to our eyes.
If you look at the spectrum for an LED bulb there is almost always a big spike in the blue part of the wavelength.
So, if you were to “turn off” the blue light, you would be turning off the source of the light itself. Because of that, filtering is often used to lessen that blue bump in the spectrum.
Uh, leds for a long time only were available in green and red. The invention of the blue led came rather late, leading to the explosion of led use because now you could finally show all the colors in a display (and create white light).
It is my understanding that most LEDs are inherently blue, but they add phosphors that mask the appearance of that blue light, making it appear white to our eyes.
If you look at the spectrum for an LED bulb there is almost always a big spike in the blue part of the wavelength.
So, if you were to “turn off” the blue light, you would be turning off the source of the light itself. Because of that, filtering is often used to lessen that blue bump in the spectrum.
Uh, leds for a long time only were available in green and red. The invention of the blue led came rather late, leading to the explosion of led use because now you could finally show all the colors in a display (and create white light).