since you're using a dSLR you can easily try out the exposure settings. take a few and see.
that's if you want the ray of light to be prominent.
the reason this works is coz the ray of light will result in a higher exposure value reading than the surroundings.. (that's why you can see that there's a ray of light there). so underexposing while metering (probably evaluative) will underexpose the averaged surroundings, and the ray of light will just stand out more in the picture.