I experimented with the lamp today, as it was a little cooler than on previous days. The outside temps are about 55 degrees f, so I would definitely notice the difference a heat source would make on a day like this.
Two things I noticed: 1) The lamp definitely heats the boat (at this modest cool temp) with no problem, and 2) I definitely need to install a heat shield on the bulkhead behind the lamp. The radiant heat from the lamp heats up the wood adjacent the burner very quickly.
So I have a brass kick-plate for the bottom of a door that I bought long ago to repair an area of the lower head bulkhead (near the sole), that I have never installed. The particular bulkhead is still in need of some sort of cover-up, but now I will press the kick-plate into service as a heat shield for the lamp. There should be enough brass left over for the other project also.
I know, it’s hard to tell what that thing is, but that’s about what the plate looks like.