Bang Guy: they are URI bulbs.
Since last posting my tank got to 86 degrees. I got it back under control and stable. The hammer isn't doing so well. It released some zooxanthellea as brown stringy stuff and retracted its polyps completely. It's been almost a week since this event and it seems to have stopped it's bleaching progress, but the polyps haven't re-extended fully yet.
I forgot that I meant to include a view of the top vent and ballast mounting. The camera is at home so I'll have to post that up later.