ISO: bicycle lighting rules ISO 6742-1 and 6742-2

These are (partly) the basis for regulations in various countries, and ISO 6742-1 is mentioned in the UK's BS6102-3 as being largely the same as BS6102-3. Hmm...

ISO 6742-1 is about active bicycle lighting (headlamps, taillamps, dynamos)
ISO 6742-2 is about passive bicycle lighting, reflectors.

I found a document in Czech of ISO 6742-1. I can't read Czech, but I will try with translation. I found ISO 6742-2 in English but that's less interesting, as it's about reflectors.

I will first analyse BS6102-3, then come back to these ISO standards. the UK's BS6102-3 really tells me already what is different, so it will be not really needed to analyse the ISO standard much.

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

OK, so now that I'm fluent in Czech (no, not really :) ), I've looked into ISO 6742-1, and from having analysed the UK's BS6102-3 I will look at what that says was different, as the British standard is based on ISO 6742-1.

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 run 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! :)

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