How to color correct photos for iPhone 5C

Hello! I am doing my high school physics project. I took pictures of LED lights and I need to find the wavelength of the emitted colors. My teacher said that photos taken by cameras have slightly different colors than the actual color. How would I manage this source of error? I need the color to be as accurate as possible.

Templeton Peck wrote:
DuckDuckCube wrote:
need the color to be as accurate as possible.
Then use a real digital camera.
Using what I have...

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