cocadave wrote
i have hid headlights and have had quite a lot of heavy fog lately and has been murder driving in it, anyway thought i'd switch on the foggys to help a bit and in all honesty they made it worse
surely having hid fogs they should cut through the fog
Sigh
Look, what do you think is happening in fog: when you switch on powerful lights aimed straight ahead, all you can see is a wall of white, less than you can see with only sidelights on.
The water droplets in the fog reflect the light from your car back at you, so the more light you pump into the cloud, the brighter the wall of white in front of you.
The only chance you have of seeing anything useful is to keep the light low and diffuse, not focussed. Then the backscattered light is kept in the plane of illumination, low, and you can see the kerbs, edges of the tarmac, white lines and so on.
You aren't going to get much range, more power just means more backscatter and impedes your ability to see anything. These lights are meant for conditions where you'd otherwise be out in front with a white stick.
On a completely unrelated note: posting without capital letters, punctuation or any kind of sentence construction implies that you don't give a **** about the people who are reading your scribble, your audience, the ones you are trying to convince. You care so little for them that you leave it up to them to make some considerable effort to translate your stream-of-consciousness ramblings into some kind of sense. At the very least this is thoughtlessly rude.