Recently I asked a question about roof mounted lamps. As I was a bit uncertain about a "plastic" lightforce to leave permanently on the roof of a disco I thought about a metal lamp. I have a lightforce 170 from about 5 to 10 years old. For me the beam is a bit "open". Not realy a concentrated beam wich gives lots of details at longer range. Mainly for counting hares/ roe/ ...... Is it possible to put a HID bulb in the older lamps? Would this help to give a more concentrated , long range beam? Are there other brands wich are better?