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    HID and LED Headlights

    This is taken directly from Section 4.1.4 of the latest MOT Inspection Manual, updated yesterday 11th Jan 2012 https://www.gov.uk/guidance/mot-insp...ical-equipment

    DB79BD1E-39DC-4F54-8A77-8961DE09D75A.jpeg
    Dave
    1974 Mk2, ZF Auto, 3.45 Diff, Datsun Driveshafts. Stag owner/maintainer since 1989.

    #2
    Don't bother with an MOT then.

    I would agree on the HID front, they are poorly designed.
    But there are some LED lamps that are compliant. Quite expensive of course,
    but they do give the same beam pattern as halogen bulbs.

    Neil.
    Last edited by NeilR; 12 January 2021, 10:34.

    Comment


      #3
      South East Wales are debating this at length on their whatsapp group! Regards, John.

      Comment


        #4
        There’s little to debate, the light source has to be approved for use in the particular light housing, if not its now an MOT failure as DJT said. Approval costs are very high and as far as I’m aware have not been done with alternative light sources. Also LED’s are evolving and new designs would need re approval, costs would not be viable for the relatively small demand.

        Comment


          #5
          looks like its back to H4s then, 80/100 still available, if you use relays!

          Comment


            #6
            Originally posted by Phil S View Post
            looks like its back to H4s then, 80/100 still available, if you use relays!
            But not legal for road use.

            Quality H4 units supplied through a relay system are much brighter than many Stag owners realise. Especially if they have been used to old units with poor reflectors and crusty wiring. They can be wired for 4 main/4 dip if you wish - it is legal on cars of the age of the Stag, or you could wire them 4 main/2 dip.
            Dave
            1974 Mk2, ZF Auto, 3.45 Diff, Datsun Driveshafts. Stag owner/maintainer since 1989.

            Comment


              #7
              Don't kid yourself, H4's are not even close to quality LED's. I recently put quality LED's in our VW Thing (Trekker) and now the night driving is every bit as good as a new Tesla....just without power steering, power brakes, a quality hvac system, etc....but it's a Thing. Plus I have never been flashed at in the Thing. Why? because the beams are properly aimed.
              https://vintagecarleds.com/shop/7-in...0-classic-kit/
              Last edited by RNF; 13 January 2021, 16:17.
              John

              Comment


                #8
                Originally posted by DJT View Post

                But not legal for road use.

                Quality H4 units supplied through a relay system are much brighter than many Stag owners realise. Especially if they have been used to old units with poor reflectors and crusty wiring. They can be wired for 4 main/4 dip if you wish - it is legal on cars of the age of the Stag, or you could wire them 4 main/2 dip.
                Agreed. HiD / LED replacement bulbs in a Stag are not legal, nor are 100W bulbs, so why is there a debate?

                I have H4 Osram Nightbreaker in the (new) outer lamps wired as main/dip, and H1 Nightbreakers in the (Cibiť) inners, main beam only. The Stag is my only car so it gets used in all seasons, weathers and at night. Since fitting relays and replacing the old outer lamps I have never felt that the lighting was less than 100%.

                I do have fog lamps below the bumper which I have used twice in the last five years, and I have a pair of 55W Cibiť Oscar lamps for when I'm rallying but they don't get used on the public roads.
                Last edited by mole42; 13 January 2021, 18:03.
                Richard
                Mabel is a white ‘72 Mk2, TV8, ZF 4HP-22 auto.

                Comment


                  #9
                  This is an interesting issue. I hope we all believe in road safety. Notwithstanding the legality for the purposes of an MOT test, my preference is to be seen as well as see particularly on those dark nights when it's raining hard. My exiting lights on both my Alvis Grey Lady and my Stag will find me wanting. In fact the first time I used my Alvis in the dark, I had to ask my wife to check outside that the headlights were indeed on The Stag is better but there are areas of the beam that have darker patches. The reflecting mirror in each headlight is sound though.

                  For now both cars have LED side lights and LED stop lights. Even the semaphore traffic direction indicators on the Alvis are LED. . Is that an MOT failure? I will in due course change my Stag headlights to LED with the corresponding lamps. If necessary I will go through the b---s aching process of changing them back over as and when submitting to MOT. My view at the end of the day is that safety is paramount.

                  Comment


                    #10
                    Originally posted by RobinLegin View Post
                    My view at the end of the day is that safety is paramount.
                    That includes not dazzling drivers coming towards you which is, no doubt, the reason why they are illegal.
                    Dave
                    1974 Mk2, ZF Auto, 3.45 Diff, Datsun Driveshafts. Stag owner/maintainer since 1989.

                    Comment


                      #11
                      DJT - agreed!

                      Comment


                        #12
                        Originally posted by RobinLegin View Post
                        If necessary I will go through the b---s aching process of changing them back over as and when submitting to MOT. My view at the end of the day is that safety is paramount.
                        So effectively, you will be driving a non-roadworthy car. The MOT test only applies on the day and at the time you present your car for a test. If, when you drive it subsequently and it doesn't comply with the road traffic act, you are driving an illegal vehicle. In less tolerant countries your car could then be crushed.
                        Richard
                        Mabel is a white ‘72 Mk2, TV8, ZF 4HP-22 auto.

                        Comment


                          #13
                          I am some what surprised at the desire for LED headlights. I have LED's everywhere except the headlights which are H4/H1's ( via relays) are are certainly fine. I am sure LED headlights maybe technically superior, but really? are they necessary?

                          I can assure you my Halogen headlamps are as good, if not better than my 2013 Mercedes SLK.... how good do you need them?

                          Dave

                          Comment


                            #14
                            Originally posted by DJT View Post

                            That includes not dazzling drivers coming towards you which is, no doubt, the reason why they are illegal.
                            Poor quality LED headlight bulbs will indeed dazzle, but a good quality one will not dazzle any more than factory fitted ones. BMW LED headlights are wonderful to be behind, but they do dazzle when coming towards you & they are factory fitted & legal. There is no reason why retro fitted ones should dazzle. This regulation is a typical knee jerk reaction to some poor products.
                            Auto transmission rebuilding since 1979 - for my sins!

                            Comment


                              #15
                              Looks like were debating on here also!

                              Comment

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