Just bought myself an IN76, sold as a demo unit at a local distributor in Sweden. When used for about 1/2 hour to an hour (sometimes more) the light intensity shifts with very short intervalls, in other words the bulb flickers. In is not overly dramatic, but highly disturbing. If I switch to High Power-mode it goes away. I haven't yet had the patience to notice if it returns after switching back from HP-mode, since I'm pretty distracted and annoyed by all this. Before the IN76 I owned a IN74 for 6 months without any of these symptoms. Is this a one way street down to replacement or is there a cure? I'm really NOT looking forward to returning everything after having used several hours to mount and fine tune. So if any one else has experienced this and/or any one has a clue to a remedy, I would be deeply grateful. My firmware is 2.6. My lamp hours are 81.