What's the unit of spectral intensity in calculation of RGB tristimulus?
You are probably working not with CIE RGB, but CIE XYZ, so these are properly denoted the XYZ tristimulus values, not RGB. Their absolute values do not matter if you want to determine the chromatacities ("color", as we commonly understand it), because you take the ratio of the components to their sum.

Once you have the XYZ tristimulus values or xy chromaticities, you can convert to something like sRGB to yield usable RGB values. You might need to scale the result to 0-255.