Eschalon lights?

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If Tachyon could post how he did the lighting om Eschalon it would be nice. Regardless how do other people think they were done and how would you have done it in thw same situation?
Here is a screenshot.
At first I thought it was vertex lighting as each tile seems to be lit differently. However, Tachyon has stated it's 100% native Bmax so probably not. the images don't have that greyish look that drawing a dark rect followed by lightblend causes.
The lit areas also do not have that 'daylight' quality of punching holes in a dark image at a smaller scale used here
My guess is that each tile is overlaid by another tile which either lightens or darkens it depending on the range of lights.
Any other thoughts?