Ok, so here is the dark version of my image. It was going to be a night time image with a beam of light coming from the top of the lighthouse, but I am having difficulty with the beam of light and light coming out from the light box (except when I use ray traced shadows, which multiplies the render time by 5, so my 58 hrs would have been nearly 300 hrs).
So instead I decided to make it a daybreak image, with just enough light in the atmosphere to see the lighthouse and it's surroundings, but also enough to make sure the light could not be seen. I also placed a small light in the lower story (those of you who downloaded the model may notice the lack of window panes) so you can imagine the lighthouse keeper having a morning cuppa before going up to switch of the light.
I also tried saving the image in the openEXR format this time as well as TIFF. With a little manipulation in FDRTools and then a little more in ACDSee (still learning the OpenEXR stuff), I came up with this. I hope you like it.
Iain
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Original TG2TP output
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Modified Image