You might try the KY CSLNM1.FY orange-yellow light. It should be good at cutting through fog without as much backscatter as some of the 6500 k lights tend to have.
I use an SST-20 in 2700k with a 5 amp driver for the same purpose. You still get good color rendition and little backscatter, but I bet the above osram orange-yellow will be a tighter beam.