Why is blue light dim while yellow light is bright?

Question

Like the title said, why does blue light seem dimmer than yellow light even when they’re the same intensity?

In: Physics

Answer 1

You know how the visible light spectrum goes “red, orange, yellow, green, blue, indigo, violet”? That’s the chunk of energy that we’re able to see, but there’s more energy “above” and “below” it. 

It goes from infrared that we can’t see, to red which is on the edge of what we can see, so it doesn’t look at bright. Then the colors right smack in the middle are easier to see, so they’re brighter-looking. Then as we get closer to ultraviolet that we can’t see, the blues and violets get less bright.