Yep. I got your interesting PM Darren, thanks.
Thanks Jerry for posting up interesting ideas for lamp units.
I went for this, just for a starting point.
http://www.ebay.co.uk/itm/2816962742...%3AMEBIDX%3AIT
It came with 55/60 xenon bulbs, so I thought it was worth a punt.
The light is White, which is an immediate improvement. I think it has better penetration on main. The dip has a worrying pale area in the close nearside, but a useful looking bright patch in the hedge about 15-20 yards away. Maybe a set up with the mot testers beam machine would help?
I have only pushed the bike out and shone it down the road so far as it's too cold for a ride by far, so I am waiting for a night time temp above at least 2C for a proper try out.