That is a good question, they should all be near 1:1:1 as we use 

Astrodon - Tru-Balance filters. 

However in real life application the colour weight will be something around
this area, its up to you to season to taste, just like in cooking. You can
also calibrate your images with a G2V star which should be like our sun which is a

What you can do it just play around with the colour balance until you get
something visually appealing to you. Normally it might look like 97%/102%/99%
as a example, each image will be slightly different as differences in the
upper atmosphere when imaging can slightly change colour balance from night
to night.