This is a terrific headlight if you want to spend $80 or so: http://www.amazon.com/MagicShine-MJ-...magicshine+808

Or you can buy 4 of the imitation lights: RioRand 4 Mode 1200 Lumen CREE XML T6 Bulb LED Bicycle bike HeadLight Lamp Flashlight Light Headlamp | Amazon.com: Outdoor Recreation

Build quality is cheaper, battery life is less consistent but really, you can get 4 of them so who cares.

I don't know what you mean by your question - does a headlight help getting a better visual, so I'm guessing you are not a native english speaker. A headlight does TWO important things for you.
1) illuminates the road in front of you (and it needs to be very bright for this to work over 10 mph)
2) identifies you to other traffic.

When I ride with a headlight, cars respect my space better (I used to get right hooked, it rarely happens when I have a headlight, even in daylight). If you ride a LOT at night, use two headlights or at least carry a spare. Wear reflective clothing too, color is irrelevant at night but reflected light really identifies you as a human.