Yamaha Biker 22

Howzit guys I have a DT125 2006 model. Can someone please tell me if i can conect my headlight directly to my battery and if i can how please help becuase every time i close my throutel i cant see eny thing cuese it dims so if im out in the sticks at night i have to keep halling to see where im going and the places we go its impossible to keep it in full taps