anyhow search of the internet and i settled on a Petzl Pixa 3 yes it was the most expensive of that range but for the spec it looked good and it didn't disappoint...
theres a nice big chunky knob which opperates the light.. which behaves a bit light a cars headlight... its got three modes which are comparable with Side/ parking light (ideal for reading and fine work,,) Headlight with a close and distant beam (ideal for walking about) and Main beam (for when needing to light up at distance but loosing the close up light)
The added bonuses is the lense rotates back into the headband to protect the lens in transit in doing so it also stops the light from turning on by locking the on off knob......

Rotated to protect the lense


and its ATEX rated = waterproof and safe to use in areas using normal electronic equipment could cause an explosion due to flammable vapors and dust .

Ive not managed to get any good pics of it in the dark.. so heres some promo blurb from Petzl....
https://www.youtube.com/watch?v=JPVjS-Hzo2s
overall im really impressed with it


