bro 1 of da rezn of low head light beam is less reflection due to da fadeness or dullness of da inner silver coating of da headlights (if ur car iz 10 or more years old), cure iz to replace old headampz wid new (crystal) headlights, dey'l sharpen da beam!
second iz due to da worst quality or old wires dat donot deliver da emitted current 2da headlight, cure, change da wiring or add a 'relay' in wiring dat'l boost da current supply 2 head bulbs!
hope dis wil help! but do specify da make n model of ya car!