I have the summit harness upgrade. It made quite a noticeable difference. Then I put in 80/100 watt clear bulbs (9004) and now I can see the road even when it's wet!! Huge difference. I've driven through rain, wet mucky brown roads, heavy snowfall and blowing snow and I could actually see the road. VERY happy. I did notice that when it's snowing heavy, the 'white' bulbs that I had before tended to reflect off the snow more making it hard to see. With the clear bulbs the light is more yellow but it was actually easier to see in adverse conditions. All that and the bulbs were less than $11. 00 /PAIR!!!