In reply to Alistair.

Hi Alistair,
There are many ways of doing this. Often, but not always, I get a fairly nice result out of Photomatix. In this particular image, that is the case. I did blend about 40% from one of the 7 shots, just to fine tune the look of the lamps. Another Approach I might use, is to take the layer that is almost completely pitch dark, except for the lamps, do the following:
1) arrange the primary image below the image with the lamps.
2) Add a mask to the image with the lamps.
3) Make a selection of the whole image, on the image with the lamps, and press CTRL/CMD + C (PC/MAC).
4) Then press ALT + left mouse click on the mask on the layer with the lamp
5) And then paste the image copied to the clipboard.
6) Select the original image again.
What happens in this case is, that wherever the mask is bright, which means the lamps, it will blend the two layers. It might leave a couple of artifacts, but it’s often a good start.

Love the image, do you cut in the lamps with a mask?