well as a follow-up from my original post... I've taken a close look at Hope District 3, Moon Sheild 60, L&M Vis 180.
and I've gone for the latter 2. the L&M Vis180 and the Moon Sheild60.
The Hope is a quality bit of kit.. I just think it's overkill and possibly too bright and overbuilt... (but I might change my mind if these other two fail me)
I'm giving the Moon and the L&M a go since they are both well made, both Micro USB chargable (using my work PC/Electric to do the honours most days) and they are bright but not crazy bright (L&M = 70 lumens, Moon = 60 lumens)
my only concers with both lights is regarding their mounting, as I've heard/read that these are not great... so I'll see for myself if these are problems.
I will let you know how I get on with these.. and will try and take some indicative photos of their effectiveness in use, and compare them to the reference point of a Smart Lunar 0.5w.