Mar 31, 2023 #1 A Aston Newly Enlightened Joined Mar 29, 2023 Messages 6 Location united kingdom For the longest narrow beam where should the bulb be regarding parabolic reflector, should it be at the point of focus or nearer the centre? Thanks
For the longest narrow beam where should the bulb be regarding parabolic reflector, should it be at the point of focus or nearer the centre? Thanks
Mar 31, 2023 #2 The_Driver Flashlight Enthusiast Joined Jan 6, 2010 Messages 1,177 Location Germany It should be at the point of focus.
Apr 1, 2023 #3 A Aston Newly Enlightened Joined Mar 29, 2023 Messages 6 Location united kingdom The_Driver said: It should be at the point of focus. Click to expand... thank you