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What's the correct term about the colour of lemon juice. Is it bright or light? I am confused between these two terms. When we see any color we can classify it into two main groups: dark or bright /light. Based on Cambridge dictionary the meaning of bright is strong in colour. Does it mean that we can use dark and bright color as synonyms?

There is some overlap and some contrast in the meanings. It matters whether you are talking about paint or light.

If you take a pure yellow colour, such as the yellow colour in the rainbow, or the yellow of the skin of a lemon, this is a bright yellow. Painters use "cadmium yellow paint" for this.

If you take some cadmium yellow paint and mix some white the colour becomes paler, more like the colour of cream. This is a light yellow.

If you take the same yellow paint and add a little black you will get a dark yellow (which quickly becomes brown as you add more black, so "dark yellow" is not actually used very often)

If you have a yellow lamp, there is an ambiguity in the meaning of "bright" as it could refer to the purity of the yellow, or the power of the lamp. A powerful lamp is bright and a weak one is dim. This meaning of "bright" is different from the meaning applied to paint.

Examples:

Van Gogh used bright yellow paint for his sunflowers paintings.

I used a pale yellow to paint the walls of my bedroom, because the bright yellow was overpowering.

If your urine is a dark yellow, you may be suffering from dehydration. Drink plenty of water!

Light means a color that tends toward white. Dark means a color that tends toward black. Bright means intense in color but not a dark color.

As applied to yellow, in the squares below, the middle center one is bright yellow, the bottom center one is light yellow, and the top left one is dark yellow. Judgment can vary about how to name shades in between.