HEllo chaps, sorry for the resurrection but i thought an update would do nicely.
I had my first ride out yesterday with the Solarstorms, and after bodging a bracket on the helmet (hazard tape and cardboard), they sat quite nicley where my old MS sit.
My old MS were quoted at 900lumen, but most seem to think they were around the 800 mark, but nonetheless i found them powerful enough on the tight twisty stuff i like to ride, true some of the faster descent could have done with a bit more power and throw but i got on OK.
These new lights having 3 modes - my old MS seemed to be somewhere between low and Mid in terms of brightness, and for most riding i was more than happy to go round on low. The High setting was treeeemedous. Plenty of throw and not too "spotty". The ride last night was a shade under 2hrs, and with a mix of mid, low and the occasional high i came back with 2 green lights still showing (so i've obviously not got a duff battery).
Anyway, short summary, for £25 they are brilliant. I'd still go with around 2000 lumen on high, but nothing more. Good light as far as im concerned and more than plenty for most riding.