My trigon 180 light until has failed. I'd hoped it was just the bulbs, so I replaced them but that didn't sort the problem. No-one seems to do a replacement (ebay even!) but there are ads for the trigon 190 unit and the size seems the same (70 cm). Has anyon else ever used the Trigon 190 lights on a 180? Did they need to do any mods to make it fit? Many thanks!