LED Foglight Project Options

[Spoke]

The design of an early foglight LED board has begun. mepstein sent me a couple of foglight fixtures to use to design the board. 2 main issues are fitment and heat dissipation. If things work out ok the design should be able to be re-laid out for the later square foglight.

The board will have 8 Cree XP-G3 high power surface mount LEDs with 350ma current each. These will burn about 1W of power with a total power dissipation expected to be less than 10W. Hopefully these will be almost as bright as a headlight.

Each LED will have its own focusing lens. The lenses are Carclo 10192 elliptical 20mm lenses. The light pattern for the 10192 lens is shown below.



This is the spectral dispersion for the lens.

[Chi-town]

Are you going to try different optics or main lenses to see if you can get the pattern back under control? If not these things will be dangerous to other drivers on the road.

[mepstein]

Are you going to try different optics or main lenses to see if you can get the pattern back under control? If not these things will be dangerous to other drivers on the road.

Do regular fogs have a cutoff?
I know if I left the fogs lit on my Durango, cars flashed me.

[Luke M]

Are you going to try different optics or main lenses to see if you can get the pattern back under control? If not these things will be dangerous to other drivers on the road.

Do regular fogs have a cutoff?
I know if I left the fogs lit on my Durango, cars flashed me.

The way most newer cars are wired from the factory you can't turn on the fog lights w/o having the headlights on. Once the headlights are on the fog lights will turn on but once you turn on the high beams the fog lights turn off. After the high beams are turned off and back to low beam the fogs turn back on. You can wire the fog lights so they can turn on w/o the headlights on. I plan on doing just that on my 6. I may even use my fog lights as daytime driving lights along with my euro led front turn signal lights.

http://www.914world.com/bbs2/index.php?showtopic=330111

Once the fog lights/headlights are adjusted there shouldn't be a problem with blinding oncoming traffic. Yes, you will get the people that still flash their lights at you if they think it's too bright. There's not much you can do about that. I drive a pickup truck as my dd and even with the headlights on low I get the oncoming traffic flashing their lights at me. My dd has factory headlights on it but it's the height of the vehicle that puts the headlights right inline of sight. The height causes it to seam brighter then what they are. Then you get the newer vehicles with their led/high res lights that seam way too bright as well. All are within DOT standards but still other drivers may feel they are too bright and flash. I get this a lot when I drive my truck. I even showed an elderly gentleman that complained that my high beams where on in a parking lot. When I showed him it was on low beam vs high beam he apologized and went on his way. Like stated once adjusted properly there shouldn't be an issue.