I modified my lights a few years back as follows:
1) Philips Xtreme Vision H1 bulbs in the low beam housings. I was running their +30 and +50 ECE bulbs that I was buying from a store in England before the latest version became available from Candlepower.
2) 9005 high beam bulbs in place of the stock 9006 in the factory fog light housings.
3) Using the adjustment screw, I took the upper beam tails a little above the horizon for some long distance vision, and more side illumination.
4) Ditched the silly plastic grills.
5) Added a relay and secondary dash switch so that I can selectively control the fog lights to come on and off with the high beams.
Comments and results:
1) The low beams are brighter and whiter within the legal coverage area, with slightly better/sharper cutoff than the stock bulbs. I attribute this to tighter build tolerance and filament placement. Net is more useable light where you need it with less glare to oncoming traffic.
2) I NEVER use the fog lights unless I am driving in FOG or blowing snow (with low beams), or when totally alone on dark country roads when using the high beams. And even when using the modified fogs with the low beams, I will sometimes switch them off to not impact oncoming traffic.
3) Despite the higher aim and brighter bulbs (1700 lumens instead of 1000 lumens, for only 10 watts additional draw), they still retain reasonable ‘fog light’ capability. They produce improved distance vision in bad weather without reflected glare as they start out low enough, and it’s far better then blinding yourself using high beams.
4) The relay / switch solution gives the options of fogs always off, fogs on with low beams but not high beams (stock arrangement), fogs off with low beams but on with high beams, or fogs on with either low or high beams.
5) The relay output is wired directly to the harness a few inches from each fog light, rather than hooking into the underdash feed. I found that by avoiding the existing dash controls in the ‘on with high beams mode’ I get about 1 volt higher to the lamps. Apparently there is a bit of a voltage drop going thru the stock arrangement. As filament emission is somewhat logarithmic with voltage, the net is a surprising increase in brightness.
6) So far, no meltdowns with 65w rather than 55w fog draw (about 1 amp more per side).
7) MOST IMPORTANT to me – Total illumination with high beams for deer spotting is just amazing! To give you an idea of what I achieve with these mods, here are some pictures I took prior to the snowfall this past year. My driveway is about 500 ft long and lined with bushes and trees. To keep the snowplow from running astray I edge it with reflectors paced out every 30 ft. About 250 ft from where the car is stopped, the driveway drifts left and descends down a slope. The very last dot in the bottom photo - low and centered in the image - is at about 350 ft away. The car is sitting with a set of markers to the left and right around the front doors, so the first markers visible are around 25 ft away.