Candela per square metre

Okay kiddo, so you know how we use light bulbs to light up a room so we can see things clearly? Candela per square metre is a way to measure how bright that light is on the surfaces around it.

See, when a light shines on something, it spreads out and covers an area. Candela per square metre measures how much of that light is hitting each square metre of that area.

Think of it like sprinkling sand over a sandbox. Candela per square metre measures how many tiny grains of sand are in each square metre of the sandbox.

So when we talk about the brightness of a light bulb or a screen, we use candela per square metre to tell us how much light is shining on each square metre of the surfaces around it. And that way we can know just how bright it really is!