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https://www.merlincycles.com/moon-meteor-storm-1300-front-light-95010.html
Not sure how long this will last in reality but it has a good level of incremental reductions in power. I use it for commuting and the light is good, has a remote on off as well if you're arsed about that sort of thing. There's also a 1700lm version on wiggle for under a ton, too.
There's a breakdown of the power modes/run times here: http://www.moon-sports.com/product-page/meteor-storm
Hope Vision 1 with some spare AA batteries. Is this for a one off ride? If so you can use mine. In my experience lumens aren't representative of actual light power. The Vision is a favourite amongst non-dynamo'd audaxers.