In reply to wi11:
I know it's off-topic but I once did the top half of Mousetrap one January in the dark. Because of the tides we'd started very late and had also grossly underestimated how long it would take to climb the route. The lighthouse's flashes were extremely useful, meaning that we could finish the route, even if it did lead to some rather, er, 'interesting' climbing.
An ascent of Lighthouse Arete illuminated by the lighthouse would probably be a little less stressful but, I guess, equally exciting.
Dave