Additional front lamps can only be classed as foglamps if they meet the following conditions:
To be used in used in conditions of seriously reduced visibility in place of the obligatory dipped beam headlamps-
( - - -)
4. Alignment: To the front and so aimed that the upper edge of the beam is, as near as practicable, 3 per cent below the horizontal when the vehicle is at its kerbside weight and has a weight of 75 kg on the driver's seat
It bears repeating that foglamps are *alternative dipped beam headlamps* and so can only be on if the primary headlamps are off (only one pair of dipped beams allowed at a time) and must be arranged not to dazzle - they are dipped by design - 3 percent is more dipped than a dipped-beam headlamp, which must be 1.3 percent down or 2 percent if the headlamp is more that 850mm from the ground
Any deviation from this means that the lamps are extra headlamps (in the old days these used to be called "driving lights" and were used on "sporty" or real rally-cars to augment the seriously poor factory-fit main beam illumination) and not foglamps.
Extra main-beam headlamps ("driving lights") must only come on with main beam and go out if you dip.
(The Road Vehicles Lighting Regulations 1989)
Fog lights are about beam pattern: low and wide, slightly down. The idea is to prevent the backscatter from blinding you (and other road users). Keeping the light low does this as far as is possible. Wide is also important, to light up the edges of the road and keep you on the straight and narrow. In fog, even with the best fog lights, you can't go fast safely, it isn't possible to see far enough; the best fogs will give you less range than dipped beams and with less clarity. In thick fog you'll be crawling; seeing the edge of the road is very important in such situations
Without fog lights you'd be going nowhere.
http://www.autoanything.com/lights/index.aspx
Putting HID's in foglamps is counter-productive, the extra light will reduce your ability to see through the fog.
Putting HID's in foglight fittings and pretending they are driving lights is fooling nobody but yourself. There is no range or focus to the beam, it will not help at any fine-weather speed. All you're doing is showing an extra pair of lights at the front. It's up to you whether you think that's a good thing or not.
To be used in used in conditions of seriously reduced visibility in place of the obligatory dipped beam headlamps-
( - - -)
4. Alignment: To the front and so aimed that the upper edge of the beam is, as near as practicable, 3 per cent below the horizontal when the vehicle is at its kerbside weight and has a weight of 75 kg on the driver's seat
It bears repeating that foglamps are *alternative dipped beam headlamps* and so can only be on if the primary headlamps are off (only one pair of dipped beams allowed at a time) and must be arranged not to dazzle - they are dipped by design - 3 percent is more dipped than a dipped-beam headlamp, which must be 1.3 percent down or 2 percent if the headlamp is more that 850mm from the ground
Any deviation from this means that the lamps are extra headlamps (in the old days these used to be called "driving lights" and were used on "sporty" or real rally-cars to augment the seriously poor factory-fit main beam illumination) and not foglamps.
Extra main-beam headlamps ("driving lights") must only come on with main beam and go out if you dip.
(The Road Vehicles Lighting Regulations 1989)
Fog lights are about beam pattern: low and wide, slightly down. The idea is to prevent the backscatter from blinding you (and other road users). Keeping the light low does this as far as is possible. Wide is also important, to light up the edges of the road and keep you on the straight and narrow. In fog, even with the best fog lights, you can't go fast safely, it isn't possible to see far enough; the best fogs will give you less range than dipped beams and with less clarity. In thick fog you'll be crawling; seeing the edge of the road is very important in such situations
Without fog lights you'd be going nowhere.http://www.autoanything.com/lights/index.aspx
Putting HID's in foglamps is counter-productive, the extra light will reduce your ability to see through the fog.
Putting HID's in foglight fittings and pretending they are driving lights is fooling nobody but yourself. There is no range or focus to the beam, it will not help at any fine-weather speed. All you're doing is showing an extra pair of lights at the front. It's up to you whether you think that's a good thing or not.
