powering a 6 Watt LED
Since your lamp is equipped with a standard connector for halogen lamps, I would suppose that it needs 12V. (It would be rather unusual for a lamp with this socket to have a higher voltage, and for a LED lamp double so).

So you would need a step-up converter, which can deliver about 0.6 ampere at 12V, when powered by 3.6V. As Olin already calculated, your batteries would then need to provide about 2A (even more since the converter doesn't operate at 100% efficiency).

Given that your hand crank can create 16V with 17mA (which is about 0.27W), this would mean that 24h working on the crank gives you 1h of lamp usage (assuming 100% efficiency - in reality this would be much worse).

Sorry - but with a hand crank delivering 0.3W electrical power in the best case won't power a 7W lamp for long.