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Oh weird :O  Think you could send me a screenshot or something of it?  Do you know what videocard / driver you're using?  Fairly certain I'm just running the Mesa driver on my Linux Mint machine with an ancient Intel HD4000.

Another possibility is that the game just isn't putting a light object on top of the module in the first place, or rendering it for some reason. Like a max-number of lights the game will bother drawing or something if you have a massive base? Will investigate :)