Depends on size of the light. I know the older Diamond lights were larger then the ones made today. Also, if you need to crate it, that will jump the price way up.
I shipped a Gold Crown light, which is similar to the size of the older Diamond lights. I am guessing it weighed a little more though. I had to have it crated also. Shipping to California from MN was 500+.
If it is a smaller newer light, and it does not have to be crated, then I think it will be more in line of what people already mentioned...around $200 give or take a few dollars.