very nice unit, i would be carefull of the heat from the heat sink, its difficult to tell from the design where the heat sink heat is lost, these things run very hot, as you have them wired like i do then you may be only supplying them with 800 mA, the driver can supply 1 at 1000mA but then as more are connected in series the power supplied drops slightly, if you could find something like a 1.2Amp driver then you would up the power, i have not yet looked for one.

But its pretty easy isn`t it and good fun!!

Having a heat sink inside the case is pretty pointless really, it's all about getting the heat from the LEDs to the outside of the light as efficiently as possible. If the outside of the light's not getting warm, then the heat isn't being transmitted outwards and it'll be getting very hot inside. Eventually your LEDs will cook and lose efficiency and you could, as Serge says, fry your circuitry...

I've just killed a bflex on an early build because - I think - it simpy got too hot inside on full whack due to inefficient heat sinking of the LEDs there's no visible damage to the driver, but despite the LEDs being fine and all the wiring giving continuity, the light's dead. Generally as long as you're moving, the flow of air clears heat pretty effectively, but you need to watch it if you stop for longer than a minute or so. 

My 700Lumen CREE MC-E torch,  ordered saturday has already shipped,  I'll have 1 of the first MC-E torches in the country,  there was only 50 world wide

fingers crossed friday, but likely  saturday when I'm away!!

Bought the Tesco torch, designing a hemet mount right now, might try it tonight

This thread on singletrack is interesting!

http://www.singletrackworld.com/forum/read.php?f=2&i=3782320&t=3782320

i think the helmet atachment from photon shop should work,

those tourches are great at £10 well impressed with mine

 http://www.thephotonshop.co.uk/page64.htm

it is a bit small, but for a head torch for £10 its unbeatable!

 imagine going riding with the tesco torch and an on one, and finding fault with both, single speed sprockets would be coming at you like ninja stars!

LOL

I registered there, but can't post yet. Maybe they spend a good few months sussing you out before they let you into the niche of all niches