To make green light from cyan light, you need to add red light to it. Cyan light has a wavelength of around 490-520 nanometers, which means it is close to blue-green on the visible spectrum. When you add red light, which has a wavelength of around 620-750 nanometers, the combination of the two colors will produce green light. This is because red and cyan are complementary colors, meaning they are opposite each other on the color wheel, and when mixed together, they produce green light.
~~~Harsha~~~