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Old 04-01-2018   #31
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Re: DRL's

There are a number of cars where the tail lights come on with the front DRLs - several Audis and BMWs and some of the most recent Fords seem to do it.

One car I've travelled in (a VW I think) had a menu option for 'Scandinavian lights' which seemed to add the regular tail lights into the DRL mix.

There seems to be a subtle difference: DRLs 'have' to show at the front. And 'position lights' have to show front and rear. But do the rules actually say that if DRLS are on, the rears have to be off? I don't think they do.

[added later]
If you dare to look in on this Audi forum, you'll see that, yes, latest Audi TT (and I suspect many other VAG models) has tail lights on with DRLs, and also a ref to the Scandinavian mode I saw in a VW menu - http://www.ttforum.co.uk/forum/viewtopic.php?t=1452953

It seems Jaguar and Renault also now have tail lights on with front DRLs: https://www.fpaceforums.co.uk/viewtopic.php?t=2860

I think the penny is dropping that tail lights on with the DRLs might be 'a good idea'

Here's an interesting read on the subject: http://www.trakglobalgroup.com/shoul...d-in-the-dark/
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Last edited by Herts Hillhopper; 04-01-2018 at 01:21.
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Old 04-01-2018   #32
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Re: DRL's

Quote Originally Posted by Herts Hillhopper View Post
There are a number of cars where the tail lights come on with the front DRLs - several Audis and BMWs and some of the most recent Fords seem to do it.

One car I've travelled in (a VW I think) had a menu option for 'Scandinavian lights' which seemed to add the regular tail lights into the DRL mix.

There seems to be a subtle difference: DRLs 'have' to show at the front. And 'position lights' have to show front and rear. But do the rules actually say that if DRLS are on, the rears have to be off? I don't think they do.

[added later]
If you dare to look in on this Audi forum, you'll see that, yes, latest Audi TT (and I suspect many other VAG models) has tail lights on with DRLs, and also a ref to the Scandinavian mode I saw in a VW menu - http://www.ttforum.co.uk/forum/viewtopic.php?t=1452953

It seems Jaguar and Renault also now have tail lights on with front DRLs: https://www.fpaceforums.co.uk/viewtopic.php?t=2860

I think the penny is dropping that tail lights on with the DRLs might be 'a good idea'

Here's an interesting read on the subject: http://www.trakglobalgroup.com/shoul...d-in-the-dark/

There is always going to be differences of opinion but the research and DRL regulations clearly say front only. They are DAYLIGHT running lights and should not be used at night (even with if they somehow have rear lights) because the beam pattern is not the same as headlights and they will cause dazzle. DRLs go off or dim when headlights are on. Rear lights have no benefit to pedestrians, who are a major reason for DRLs, and little to other road vehicles whose operators should be looking forward anyway. Rear lights also increase the power, fuel consumption and CO2 emissions due to DRLs by 100%. You may have nailed it with the "Scandinavian" mode, but that's not "DRLs" by the latest modern legal definition.


Robert G8RPI.
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Old 04-01-2018   #33
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Re: DRL's

Quote Originally Posted by g8rpi View Post
There is always going to be differences of opinion but the research and DRL regulations clearly say front only. They are DAYLIGHT running lights and should not be used at night (even with if they somehow have rear lights) because the beam pattern is not the same as headlights and they will cause dazzle. DRLs go off or dim when headlights are on. Rear lights have no benefit to pedestrians, who are a major reason for DRLs, and little to other road vehicles whose operators should be looking forward anyway. Rear lights also increase the power, fuel consumption and CO2 emissions due to DRLs by 100%. You may have nailed it with the "Scandinavian" mode, but that's not "DRLs" by the latest modern legal definition.


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Hi.
While I agree with this 99% we have to get one thing into perspective. Lights only consume a very small percentage of the power produced by the fuel from the engine. Say the engine produces 51Kw and you add in two extra rear bulbs at 5 watts each giving a total of 10 watts this is only a drain of 0.02% of the available power, OK there are losses but at this level it's insignificant as will any rise in CO2 or fuel consumption.
The modern car with its electronics, air con heated seats, screens are far more greedy than lights are. It I am afraid is annoying when even the government are bringing into the equation CO2 increase. Perhaps then they should ban us from having tools in the boot or breakfast prior to a journey, all that bacon and eggs adding to weight
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Last edited by murphyv310; 04-01-2018 at 13:40.
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Old 14-01-2018   #34
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Re: DRL's

Hi, I use LED replacement DRLs on the Panda, Halfords do them, they are dual “filament” (dual power?) so dim once the main lights are switched on. Look far better than the standard yellowish bulbs and don’t upset the Canbus!
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Old 14-01-2018   #35
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Re: DRL's

Quote Originally Posted by PandaPete688 View Post
Hi, I use LED replacement DRLs on the Panda, Halfords do them, they are dual “filament” (dual power?) so dim once the main lights are switched on. Look far better than the standard yellowish bulbs and don’t upset the Canbus!
Unfortunately these bulbs are not legal for road use; this is stated on the Halfords website.

IMO updating the lighting regulations to reflect advances in technology is well overdue; but until then, I'd say the risk of fitting parts clearly marked 'for off road use only' isn't worth taking. An insurance company could use this as an excuse to avoid paying out in the event of a claim, and if an overzealous policeman is looking for a reason to give you a bad day, you've just handed him one on a plate.
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Last edited by jrkitching; 14-01-2018 at 12:49.
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Old 14-01-2018   #36
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Re: DRL's

I would normally agree about “not for road use” parts, but these are no brighter than other DRLs around and the do dim as do the standard bulbs. There would be no reason in my opinion for a policeman to physically check the bulb, plus it’s not a “dodgy” colour like the coloured parking bulbs that some people are fitting nowadays!😀
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