If you want to light up the road sufficient to go fast, then you will need powerful lights.
The most hassle free, is a Schmidt (?) dynahub. It gives about 3W of light and has fit and forget reliability.
However I don't find it really bright enough to ride at training pace on country lanes without either a centre or edge white line. On the lanes round here I like at least 12W of halogen brightness. Now you are getting more like riding normally instead of peering into the gloom.
As I get a lot of use out of my lights, both on and off road, I have invested in a set of Lumicycles, which are UK made and only available direct from them. There are cheaper (and way more expensive) ones but the Lumicycles are well made and seem to be (after 6 years) a good, long lasting bit of kit.