# What's the unit of spectral intensity in calculation of RGB tristimulus?

According to CIE color space and relation of RGB with XYZ, we can express

$$R = \int_0^\infty I(\lambda)r(\lambda)d\lambda$$$$G = \int_0^\infty I(\lambda)g(\lambda)d\lambda$$$$B = \int_0^\infty I(\lambda)b(\lambda)d\lambda$$

where $r(\lambda),g(\lambda),$ and $b(\lambda)$ are the corresponding color matching functions and $I(\lambda)$ is spectral intensity function.

Now, I am trying to calculate RGB values of hyperspectral image captured by hyperspectral camera. And from the hyperspectral image, I can get spectral intensity values between 0 - 65535. But I am not sure about unit or range of the intensity function $I(\lambda)$ above. Is it values between 0 - 1?