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 Post subject: All day lights (again)
PostPosted: Sat Mar 01, 2008 11:06 
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Dimwits: EU's edict to keep car lights on ALL day will cost drivers £160 a year in wasted fuel

By DANIEL MARTIN
Last updated at 21:14pm on 29th February 2008

Motorists will be hit by up to £160 more in fuel costs because of a "ludicrous" European directive forcing them to drive with their lights on all day.

Campaigners say the new rules will make the roads more dangerous for motorcyclists and will lead to more deaths.

Britain opposed the measure but was unable to block it because a majority of other EU nations were in favour.

Transport Minister Jim Fitzpatrick admitted this week that the rules, which will come into force in 2011 and relate to new cars, would lead to annual fuel consumption rising by 5 per cent.

According to AA figures, for the average family-sized car, driving the average 8,770 miles a year, this would increase fuel costs by £68 a year at today's prices.

That is based on a car doing 31 miles per gallon. But some models do only 13mpg, meaning the increase could be as much as £160 a year.

Heavy goods vehicles would see costs shoot up by £260 a year, based on the average 8.1mpg rate.

Campaigners say the ruling, which will be in force from Lapland in the north to Cyprus in the south, will harm the environment by wasting fuel.

Britain opposed the directive but was unable to prevent European transport ministers approving it, because transport measures do not require unanimous backing by EU member states.

Daytime-running lights were made compulsory in Scandinavian countries in the late 1970s - which is why Swedish-built Volvos always have their lights on.

In 2006, Austria, Croatia and the Czech Republic became the first countries outside northern Europe to follow suit. Daytime lights are now used in 14 states.

A study by Dutch researchers found they could save 5,500 deaths and 155,000 injuries across Europe.

Greg Knight, Tory MP for East Yorkshire, said: "This idea was being pushed by Scandinavian countries and it's absolutely ludicrous that it should be imposed in a blanket fashion across Europe.

"The UK does not suffer from the short hours of daylight as in northern Europe, and places like Spain certainly don't. All the green groups are worried about the environment - surely this will make it worse.
"There are also fears it will harm road safety."

The proposal was opposed by Stephen Ladyman, who was transport minister during earlier discussions on it in Europe.

Last night Mr Ladyman, who is now a backbencher, said: "This directive will kill a lot of motorcyclists. They use daytime lights to make them easier to see, but if cars are using them as well, motorbikes will just blur into the background.

"This is only being brought in because Germany and Austria don't want to have proper speed limits on autobahns, so they think this will be a good road safety measure."

It had been feared that all cars would be covered by the rules, meaning that those not fitted with daytime running lamps would have had to drive around with dipped headlights.

But European ministers backed off from this proposal.

Edmund King, president of the AA, said: "Daytime-running lights offer a significant safety advantage, particularly for pedestrians trying to spot moving cars through a line of parked vehicles.

"However, motorcyclists are very worried that other motorists will no longer be able to pick them out from other traffic.

"The extra carbon dioxide emissions from all cars having to turn on their headlights during the day was a major concern when daytime-running lights were first suggested in Europe.

"However, that threat has been diminished by restricting the measure to new cars only, many of which have energy-saving LED lights for driving in daylight."

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PostPosted: Sat Mar 01, 2008 13:37 
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"This is only being brought in because Germany and Austria don't want to have proper speed limits on autobahns, so they think this will be a good road safety measure."


Quote:
"The extra carbon dioxide emissions from all cars having to turn on their headlights during the day was a major concern when daytime-running lights were first suggested in Europe.


Is there some template for motoring stories now that mandates the insertion of at least one speed related and one CO2 emissions related comment, no matter what the original subject of the article is? :roll:

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PostPosted: Sat Mar 01, 2008 15:22 
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I am confused why vehicles with higher fuel consumption should incur increased "lighting costs"?

Surely the dynamo/generator/alternator should present a similar load for given power generation regardless of the vehicles MPG. i.e. 100 watts worth of lighting needs 100 watts times some conversion ratio, whether the vehicle weights one ton or forty tons?

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PostPosted: Sat Mar 01, 2008 16:22 
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boomer wrote:
I am confused why vehicles with higher fuel consumption should incur increased "lighting costs"?

Surely the dynamo/generator/alternator should present a similar load for given power generation regardless of the vehicles MPG. i.e. 100 watts worth of lighting needs 100 watts times some conversion ratio, whether the vehicle weights one ton or forty tons?

mb


Yup, they've taken what it'll cost an "average" car in mpg (allegedly 5%) and applied it to other cars by using that same % of mpg and not the actual power requirement... Typical eco-mentalist twisted misunderstanding of science and logic.

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PostPosted: Sun Mar 02, 2008 11:06 
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I can't figure out how this is proposed to work. If it is mandatory for cars built after 2011 what happens to the cars already on the road. Around 30% of cars are over 10 years old so it will be about 2025-2030 before all cars on the road have it. What happens in the mean time?

If you have to drive with your lights on and it is not an automatic feature it will be chaos. Some will and some won't.

Another government/EU shambles.

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Britain opposed the measure but was unable to block it because a majority of other EU nations were in favour.


SO we no longer have a say in our own country.....nice one Brown!

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 Post subject:
PostPosted: Sun Mar 02, 2008 11:25 
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boomer wrote:
I am confused why vehicles with higher fuel consumption should incur increased "lighting costs"?

Surely the dynamo/generator/alternator should present a similar load for given power generation regardless of the vehicles MPG. i.e. 100 watts worth of lighting needs 100 watts times some conversion ratio, whether the vehicle weights one ton or forty tons?

mb


How much energy does the engine use/waste to produce that 100 watts though?

I can produce 100 watts of power with a highly efficient generator, or I can build a generator the size of my house and make sure it's so inefficient it only produces 100 watts of power.


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PostPosted: Sun Mar 02, 2008 11:41 
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Gizmo wrote:
"Britain opposed the measure but was unable to block it because a majority of other EU nations were in favour."

SO we no longer have a say in our own country.....nice one Brown!
I had to laugh the other day when Brown said, referring to the rooftop protesters against the Heathrow runway, that policy should be decided in the House of Commons and not on it. I thought at the time that it's actually Brussels who are in charge.

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 Post subject:
PostPosted: Mon Mar 03, 2008 00:08 
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weepej wrote:
I can produce 100 watts of power with a highly efficient generator, or I can build a generator the size of my house and make sure it's so inefficient it only produces 100 watts of power.

Well whoopy-dooo, what a clever thing you are :roll:

I was querying the simplistic and almost certainly erroneous way that the press have extrapolated the energy required to power daytime-running lights.

Sensible folks, such as hairyben, can see the flawed logic, but trolls like you go off on a pointless tangent! Still, don't let me stop you building your house-size generator ;)

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PostPosted: Mon Mar 03, 2008 00:40 
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What an utter load of old cobblers!!!!

Of COURSE big cars have proportionaly more energy-hungry light bulbs in them!!! Don't you knowthey're specially made to ensure that the plutocrats can maximise their environmental impact??? {/sarcasm mode off/}

No, it's utter rubbish. Big cars and little cars use the same amount of power to light the same bulb and the bulb has no way of knowing what car it's going to be fitted in. Of course there are differences in the power required to light a gas discharge bulb, an incandescent one and an LED array but that's the same like-for like and has nothing to do with the thirstiness of the engine!

As for 5% - well, I'm deeply sceptical. Although not an automotive electronics expert, the total lighting requirement is likely to be about 150 watts (2 headlamp bulbs at 55 watts, 4 sidelight bulbs at 5 watts apiece and a couple of number plate light bulbs). IF we double that because an alternator is about 50% efficient, we get 300 watts or about 0.5% of a 60kW engine's output. Now I don't know how much of that 60kW the "average" car would use on the combined drive cycle (presumably where the fuel consumption figures are taken from), but I can't see 0.5% of maximum power output accounting for 5% of fuel consumption!


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PostPosted: Mon Mar 03, 2008 01:40 
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Don't lorries run off of 24v so for the same wattage bulbs the cable losses would be less?

Although cars in the not too distant future will probably have LEDs anyway, at least for position lamps, so the difference will be much less.

Still, I don't want government dictated lights. I want to control them myself.

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 Post subject:
PostPosted: Mon Mar 03, 2008 07:42 
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Mole wrote:
No, it's utter rubbish. Big cars and little cars use the same amount of power to light the same bulb and the bulb has no way of knowing what car it's going to be fitted in.


Sure, there's a little artistic license in the reporting here, what's new, especially from the Mail which is not known for its technical accuracy. This is the same paper that a while back reported in an anti 20mph limit story that travelling a mile at 20mph rather than 30 emits three more tonnes of CO2.

However, it is designed to get the anti EU brigade up in arms.

But, sure the bulb takes the same amount of power in a big or a small car, but the big car will most likely use more energy to generate that power.

But absolutely not to the level that the story is implying.


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 Post subject:
PostPosted: Mon Mar 03, 2008 09:16 
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It won't even be 1% of the vehicle power output.
Quote:
"However, that threat has been diminished by restricting the measure to new cars only, many of which have energy-saving LED lights for driving in daylight."
It seems unlikely that headlights will be used, Volvo don't use high power bulbs...

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PostPosted: Mon Mar 03, 2008 09:59 
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But, sure the bulb takes the same amount of power in a big or a small car, but the big car will most likely use more energy to generate that power.


Hmm, I dont know about that.

Take two vehicles

1) Landcruiser 4.2TD (Mine :D )
2) Corsa 1.4 16V (A lady freinds :wink: )

I would think that hauling 2 tons of motor vehicle with perminent 4 wheel drive, an auto box, and all terain tyres would require considerably more power (IE several times as much) as hauling around 800Kg of vausxhal corsa!

However overall the Landcruiser uses only 50% more fuel than the corsa (24 mpg as opposed to about 37)

This would suggest tha the specific efficency (Ie Grms fuel/horsepower hour) of my landcruiser engine is considerably better than that of the corsa!

IE the marginal extra fuel consumed by leaving my lights on will actually be a good deal less than on the smaller car.

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PostPosted: Mon Mar 03, 2008 10:50 
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weepej wrote:
...but the big car will most likely use more energy to generate that power.



Why?

Do big cars have less efficient alternators or something?

I agree that big cars use more fuel to haul their fat lardy butts around but they ought to use the same amount of power to operate lights of the same power output!


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PostPosted: Mon Mar 03, 2008 13:14 
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Mole wrote:
weepej wrote:
...but the big car will most likely use more energy to generate that power.



Why?

Do big cars have less efficient alternators or something?

I agree that big cars use more fuel to haul their fat lardy butts around but they ought to use the same amount of power to operate lights of the same power output!


Nah....everyone knows that the efficiency of the alternators fitted to 4wd's is much less than the 54% of a small car. Land rovers are about 1% efficient....compared to fiestas 54% :roll:

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PostPosted: Mon Mar 03, 2008 15:04 
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Mole wrote:
weepej wrote:
...but the big car will most likely use more energy to generate that power.



Why?

Do big cars have less efficient alternators or something?

I agree that big cars use more fuel to haul their fat lardy butts around but they ought to use the same amount of power to operate lights of the same power output!


i suspect the hypothesis here is....

if an engine is inefficient then increasing the load on it will have a greater effect on it's economy than the same increase in load applied to a more efficient engine.

a 4x4 is viewed as 'inefficient' hence the belief that effect will be worse on such vehicles.


you'd have to turn to the figures to prove/disprove this one but the overall efficiency of an engine of any size is probably pretty similar (i.e. all woeful !).
those coupled to big 4x4s with their weight & aerodynamics will move that vehicle less efficiently, even if the engine is running at the same efficiency as one in a smaller vehicle.

since lighting loads will come from the alternator and act pretty much directly on the engine. the extra energy lost due to this load should be roughly the same for any vehicle.

hows that sound ?


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PostPosted: Mon Mar 03, 2008 15:26 
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Yes, the normal way of measuring an engine's efficiency is a figure of the amount of fuel it uses to pull the vehicle a certain distance. This is very dependant on the weight it has to pull.

So that's actually efficiency of the engine + vehicle, not the engine alone.

I have often wondered what the figures would be like for just the efficiency of an engine on its own. Amount of fuel in vs watts of power out. Something like that.

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PostPosted: Mon Mar 03, 2008 16:33 
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Ziltro wrote:
I have often wondered what the figures would be like for just the efficiency of an engine on its own. Amount of fuel in vs watts of power out. Something like that.


20% mechanical efficiency is usually quoted, ~40% to coolant, ~40% out the exhaust and a smidgen to friction.


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PostPosted: Mon Mar 03, 2008 20:04 
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OK, let me put it like this.

Would you rather have a three litre engine driving the alternator supplying the the 60 watt light bulb in your room or a one litre engine?

Ignore the Mail's ridiculous anti EU spin on the story.


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PostPosted: Mon Mar 03, 2008 20:16 
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That's not a very good comparison, an engine powering a light bulb in a house won't be pulling its self, or a vehicle along the road.

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