Warning, nerdy vehicle lighting designer content below!
Best thing to do is start looking at the basics:
Are the lenses clean?
Are the lamps adjusted correctly for dip and aim?
How old are the Bulbs as halogen bulbs degrade over their life.
Is there condensation inside the light as this can cause rust in the lamp terminals and shorten the life of the bulbs.
If the lenses are going cloudy you can get polishing kits to fix this ( but these tend to be of dubious quality and are usually only a stop gap as the plastic lens has probably degraded so badly if this has happened it will be far weaker and liable to crack)
After market HID kits are flat out illegal. Sorry guys, if the cops don’t notice ( and they usually won’t) the MOT inspector probably will as he will look for the E marking on the lamps and the test centres are on the look out for these systems now. Also it’s an illegal mod in the eyes of your insurance company…so if you have had an accident…
The same goes for LED bulb kits.
You can get higher power bulbs but again you have to be careful, the super high power halogen bulb kits ( they are marketed as Xenon bright but they are not Xenon HID) are of varying power output and highly variable performance improvement but the lifespan of the bulbs range from poor to dreadful. I’ve heard of people blowing out sets of these bulbs in less than two months of night driving….not good at £20 plus for a pair.
High power bulbs lifespan tends to be about 200hrs whilst normal halogen bulbs are at about1200-2000 hrs. Proper OEM Xenon HID’s are at about 10,000hrs plus and new LED car lights are rated at whole life of the car ( so it’s assumed they will do 20,000hrs) but these are really only widely available on high end Audis, Mercs etc. so for performance you do pay for what you get at the moment. LED headlights will be more widely available over the next 5-10 years as they use a lot less power (3-5w as opposed to 55w on halogen) so they help with CO2 emission reduction.
Told you it was nerdy content…
Auxiliary lights are not illegal (providing they are E marked) though but again it’s a mod to your car so the insurance company needs to be informed. But if you want to go down this route one of my ex colleagues makes rather nice high performance road legal LED high beam lights which are the far side of awesome….as used on the TopGear toyota hilux they took to the magnetic North Pole. 🙂