ISO: bicycle lighting rules ISO 6742-1...5

These are (partly) the basis for regulations in various countries, and ISO 6742-1 (v2, 1987) is mentioned in the UK's BS6102-3 as being largely the same as BS6102-3. Hmm... And in 2018 I was told that the coming update of TA will refer to the 2015 versions of ISO 6742 in various parts.

Some of these are just several pages with useful writing (not the table of contents, copyright notice and BS like that) and yet cost quite a lot. Let's take a look at what this money making (or taxation, if you prefer) machine called 'iso' charges for these 'standards': 6742-1, 22 pages of which only 18 have real information, CHF 88 = EUR 76,-, 6742-2: 18 pages with information, CHF 88 = EUR 76,-, 6742-3: 7 pages with rather pointless information, CHF 58 = EUR 50,-, 6742-4: 18 pages of which 13 have real information, CHF 88 = EUR 76,- 6742-5: 10 pages of which 5 have real information, CHF 38 = EUR 33,-, total price, for 61 pages with information, some pages nearly blank (esp. all literature reference pages at the end), EUR 311! Compared to this, DIN 33958 which incorporates most of what is in ISO 6742-x, is 'cheap' at EUR 103 for ca. 31 pages with real information.

Before looking at any of the ISO standards, I first analysed the UK's BS6102-3 (2003) which told me already what is different compared to the pre-2015 ISO 6742-1, so it was not really needed to analyse ISO 6741-1 (1987) much. I found a document in Czech of ISO 6742-1 (1987-9-15).

2015-1-28: ISO/DIS 6742-1 will replace ISO 6742-1...

2018-1-30: I've got ISO 6742-1 (3rd edition, 2015-5-15), ISO 6742-4 (1st edition, 2015-5-15) and these have a lot of similarities with DIN 33958 (2014-12). I see no mutual references so which copied which? (e.g. the electronic load). These standards from 2014 and 2015 are incomparable with the old ISO 6742-1 (1987) and BS6102-3 (with updates up to 2003).

ISO 6742-1 (2015-5-15)

To come.

ISO 6742-4 (2015-5-15)

To come.

Old version of ISO 6742-1 (1987-9-15)

This is from 2015-5-15 onwards (when the new versions of ISO 6742-x were published) only of interest to compare with BS6102-3 (2003)...
OK, so now that I'm fluent in Czech (no, not really :) ), I've looked into ISO 6742-1, and having analysed the UK's BS6102-3, which tells what is different compared to ISO 6742-1 (1987) that it is based on, helped with that. The structure of ISO 6742-1 (1987) is very similar to BS 6102-3 in amount of text and the pictures, which is partly the reason why even without knowing Czech I can deduce what the differences are.

ISO 6742-1: Headlamps, taillamps, generators, batteries

Part 5. Photometric analysis of headlamps

This is similar to the UK's BS6102-3, as mentioned in that document, but there are in ISO 6742-1 no points of minimum value prescribed above H (horizon). Also the value above H may be higher than in BS6102-3, namely the maximum is 120 cd (1.2 lx at 10 m), and in BS6102-3 it's 70 cd (0.7 lx at 10 m).

Part 6. Photometric analysis of taillamps

In the UK's BS6102-3 there are 4 extra points around the centre point 'A', which shows again (it is 'again' as I first compared BS6102-3 to StVZO) that BS wants more emphasis on light going (almost) straight to the rear.

Minimum brightness values in various points (from straight to the rear):

          | -110 deg | -45 deg  | -10 deg |   0 deg |
  10 deg  | 0.02  cd | 0.02  cd | 0.10 cd |         |
   0 deg  |          |          |         | 0.75 cd |

This table should be mirrored up-down and left right to get all the points, so this is one quadrant.

So these values are all lower, a lot lower in most places, than in the UK's BS6102-3. It seems that where these brightnesses are achieved may deviate up to 15 degrees from the specifications, just like in the UK's BS6102-3 (both horizontal and vertical I presume, it's not made clear in the UK's BS6102-3).

Vertical cone for a taillamp. In the UK's BS6102-3 this only needs the forward-upward section (and strictly reading not even a cone, just a sector, namely in the vertical plane between taillamp and cyclist).

Part 8: Battery section

There's a lot more text in the UK's BS6102-3 in the section about non-rechargeable batteries. It seems in this ISO standard they write about what to do if bulbs wear out etc. Well, not very interesting.

I think that's enough, it's not really interesting to search for any other deviations from the UK's BS6102-3.

ISO 6742-2: Reflectors

Sorry, I can't be bothered with this, it is just not interesting! :)

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