Update: the reason I did this change was because I often have to travel down an unlit section of motorway and it's pretty unnerving at times and forces me to slow right down. I went down it last night and, although the light output is there, I realised my reflector is abysmal. It wasn't as obvious with a filament bulb.
It seems a new headlight is in order. The original is broken but I'll refit it and take a few photo's for your evaluation but it won't be staying on. As much as I like the 4"er, I feel it's too small to be practical. A 5 3/4" is called for, methinks.
