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TDI Fuel Economy Discussions about increasing the fuel economy of your TDI engine. Non TDI related postings will be moved or removed.

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Old February 9th, 2017, 04:45   #31
jdulle
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So if you are driving a lot at night, it might make sense. It would be small, the difference. But every little thing adds up. Just like with the insight, they did so many things to improve aero and lighten the car. The bottom third of the engine is magnesium. The valve cover gasket is plastic. The hood is carbon fiber. The rear drums are aluminum. I just replaced the license plate lights, and IIRC some running lights on the front of the car with LED. Partly I hate when you go to the auto parts store and they charge 4 or 5$ for 2 tiny bulbs, and the second one sits in the glove box and eventually gets broken. The LEDs will last the life of the car. I would get LRR tires when the ones on there wear out, and inflate to 40psi. They will save more fuel than the LEDs, but it will also be minor. Biggest savings are from driving slower, and the grill block. I have not done the grill block on my tdi because I don't drive it in the winter, but my insight has a full block and the civic has 3/4 blocked off in the winter.
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Old February 9th, 2017, 16:29   #32
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Originally Posted by turbovan+tdi View Post
Why is it unfortunate? You'd be the first one that cut their bill by 40% changing to LED's. I've done it, my friends have done it and the bill didn't change one bit, or if it did, not enough to notice. 40% is cutting your bill in half, the only way I can see it being done is if you left every light on in the house 24 hours a day.

Either way, glad it worked out for you.
Do you have kids? Yes the lights stay on 90% of the time no matter what you do!

I am a sustainability professional and it is not BS.
If you change from CFL's the difference will not be this dramatic.
However, CFL's use 70% less energy than incandescent's and LED's use 85% less than incandescent's.
The greatest difference in the long run between LED and CFL's are the lifetime of the bulb.
Another great thing about LED bulbs is spectrum availability. Use daylight spectrum and you will see true color!

My bulbs by the way are 4 years old or so.
I recommend getting them at the hardware store when the power company is doing their mandatory subsidization. I got my bulbs for around $3 each Regular $7-$9.

I am all for going to DC lighting throughout the house.
Both CFL's and LED's can operate on DC more efficiently than AC.
This would create an even greater reduction in energy consumption due to lack of conversion, or more correctly stated rectification.

So far as Automotive bulbs goes the design of the vehicle limits greatly the benefit to using LED.
For our VW's, LED headlights are not compatible with the bulb housing.
LED bulbs are only really viable in sockets inside the vehicle and exterior for markers, backup lights (which correct ones would be great), and the license plate lamp.

Power consumption will not be that greatly reduced and the main benefits would be greater illumination and a longer lifetime if you get good quality bulbs.

Just as with any other part on our cars, CHEAP is WORTHLESS!

Use Quality LED bulbs in the right spot and never replace them.
You can use LED with resistors built in if they are quality and they will not negatively affect the experience of driving, however, longer life is the sole benefit!

You will never save enough energy with automotive bulbs to pay for them, however, you may go through few enough bulbs to pay for them.
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Old February 9th, 2017, 16:49   #33
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I have to call fake news on this one.
Damn......Do you just like to argue? Ha Ha Ha
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Old February 9th, 2017, 17:40   #34
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Quote:
Originally Posted by eddieleephd View Post
Do you have kids? Yes the lights stay on 90% of the time no matter what you do!

I am a sustainability professional and it is not BS.
If you change from CFL's the difference will not be this dramatic.
However, CFL's use 70% less energy than incandescent's and LED's use 85% less than incandescent's.
The greatest difference in the long run between LED and CFL's are the lifetime of the bulb.
Another great thing about LED bulbs is spectrum availability. Use daylight spectrum and you will see true color!

My bulbs by the way are 4 years old or so.
I recommend getting them at the hardware store when the power company is doing their mandatory subsidization. I got my bulbs for around $3 each Regular $7-$9.

I am all for going to DC lighting throughout the house.
Both CFL's and LED's can operate on DC more efficiently than AC.
This would create an even greater reduction in energy consumption due to lack of conversion, or more correctly stated rectification.

So far as Automotive bulbs goes the design of the vehicle limits greatly the benefit to using LED.
For our VW's, LED headlights are not compatible with the bulb housing.
LED bulbs are only really viable in sockets inside the vehicle and exterior for markers, backup lights (which correct ones would be great), and the license plate lamp.

Power consumption will not be that greatly reduced and the main benefits would be greater illumination and a longer lifetime if you get good quality bulbs.

Just as with any other part on our cars, CHEAP is WORTHLESS!

Use Quality LED bulbs in the right spot and never replace them.
You can use LED with resistors built in if they are quality and they will not negatively affect the experience of driving, however, longer life is the sole benefit!

You will never save enough energy with automotive bulbs to pay for them, however, you may go through few enough bulbs to pay for them.
Cheaper at costco, got 100s for 1.79, 60s for 1.65
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Old February 9th, 2017, 19:39   #35
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Damn......Do you just like to argue? Ha Ha Ha
Lol.
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Old February 10th, 2017, 05:29   #36
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Another great thing about LED bulbs is spectrum availability. Use daylight spectrum and you will see true color!
Don't conflate color temperature and color rendering index. To see true color, you need high CRI. Color temperature is just the tone of the light (warm/cool). Most of the "daylight" LEDs and CFLs you find in places like Home Depot and Lowe's are only ~80 CRI.

There are some daylight spectrum lamps that mimic actual daylight (about 5000K and 98 CRI), but they're pretty expensive and not available at your local hardware store.

You also don't want lights that are too blue/cool at night, as blue light slows natural melatonin production and screws up the body's circadian rhythm.

</offtopic>
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Old February 16th, 2017, 13:11   #37
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Don't conflate color temperature and color rendering index. To see true color, you need high CRI. Color temperature is just the tone of the light (warm/cool). Most of the "daylight" LEDs and CFLs you find in places like Home Depot and Lowe's are only ~80 CRI.

There are some daylight spectrum lamps that mimic actual daylight (about 5000K and 98 CRI), but they're pretty expensive and not available at your local hardware store.

You also don't want lights that are too blue/cool at night, as blue light slows natural melatonin production and screws up the body's circadian rhythm.

</offtopic>
You are correct, but please don't put anything in the bathroom or bedroom that isn't daylight spectrum, if LED go dimmable too.

Wherever the woman does her makeup is best to use daylight spectrum.

Temperature of the bulbs isn't nearly as important as spectrum.
Have you ever looked at something indoors and thought it had an awesome color, like at the store, then got outside and saw it in the daylight only to think this looks horrible?

Spectrum of the bulb distorts the color. Yellow reflects back yellow well but your greens and other colors will look funky and the yellow will even be different outside.
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Old February 16th, 2017, 21:55   #38
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LOL! Is this seriously a real post?

That usage is so minor... No real impact.

Yeah get rid of that alternator and run off battery. When do you charge the battery, it goes dead eventually?
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Old February 20th, 2017, 05:55   #39
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Quote:
Originally Posted by eddieleephd View Post
You are correct, but please don't put anything in the bathroom or bedroom that isn't daylight spectrum, if LED go dimmable too.

Wherever the woman does her makeup is best to use daylight spectrum.

Temperature of the bulbs isn't nearly as important as spectrum.
Have you ever looked at something indoors and thought it had an awesome color, like at the store, then got outside and saw it in the daylight only to think this looks horrible?

Spectrum of the bulb distorts the color. Yellow reflects back yellow well but your greens and other colors will look funky and the yellow will even be different outside.
I have full spectrum 5000K 93 CRI fluorescent lamps in our bathrooms and kitchen under-cabinet lights, but I'd never do that in the bedroom. At some point I'll upgrade the bathroom to 98 CRI for even better color.

Finding true full spectrum LED lamps is challenging. 90 CRI is what I consider to be the minimum acceptable level for areas that need good light, and 80 is meh. Unfortunately, 80 is mostly what you find on the market today. If you want 95-98 (I've never seen 100), you need to pay a lot of money from an online retailer of specialty lamps.

And for what it's worth, you can get lower color temperature lamps that have high color-rendering. I'm installing 2300K "amber glow" 90+ CRI LED bulbs in a restaurant right now to replace all of their MR-16 halogens. The warm color sets a nice mood for dinner. Another restaurant nearby is installing cheap daylight LEDs on their patio and they're borderline-offensive when you're trying to eat dinner.

Sorry for going way off topic for the thread - I'm a lighting geek and I can't help myself.
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Old February 20th, 2017, 08:30   #40
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Time for this thread to be moved over to the Better Homes and Garden forum
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Old February 20th, 2017, 10:16   #41
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Just "self licensing"...
A person seeking validation for something they want too do...
And seeking the validation from strangers...
Go figure.
Nobody has said it smart...
But many mods are done for the sake of modding....And if the person can justify ...Even in just their own mind ....It makes it simpler for them to feel good about it.
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Old February 21st, 2017, 11:59   #42
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If you want to do it for the sake of modding, have at it. Just be aware that it'll never pay you back (as is the case with most modifications).
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Old February 22nd, 2017, 10:32   #43
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Quote:
Originally Posted by eddieleephd View Post
You are correct, but please don't put anything in the bathroom or bedroom that isn't daylight spectrum, if LED go dimmable too.

Wherever the woman does her makeup is best to use daylight spectrum.

Temperature of the bulbs isn't nearly as important as spectrum.
Have you ever looked at something indoors and thought it had an awesome color, like at the store, then got outside and saw it in the daylight only to think this looks horrible?

Spectrum of the bulb distorts the color. Yellow reflects back yellow well but your greens and other colors will look funky and the yellow will even be different outside.
CCT doesn't cause that, nor CRI, but spectral power distribution is what causes that. CRI is derived from SPD, but what you're referencing is largely due to you LED lights not emitting the appropriate levels of light in that portion of the spectrum. It's not uncommon for 2 types 90 CRI LEDs to still have 1 with the typical blue spike and another to have it diminished significantly. Even with current phosphors, there still is a well around 480-490 mm so cyan/teal comes out poorly.
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Old February 22nd, 2017, 11:21   #44
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I put some LEDs bulbs in the Element after the HIDs started to fade to the point where I couldn't see much. The LED bulbs cost me $135 CDN (~$25 USD ) .
The Element has stock projectors so the focus on the HID's was decent with out blinding oncoming drivers. The LEDs are bright and 6000K color is nice as well.
After looking at the design, I think these will work well in the standard reflecting headlight housings. They have a small square where the light comes from which will keep the blinding scatter around the same as filament bulbs and way better than HIDs in reflecting housings.
For the price and light output, I am very happy with my LEDs.
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Old February 22nd, 2017, 12:10   #45
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Scatter is a function of where exactly in the focal point of the housing those small emitters line up. If it's too wide or not in exactly the right position, the scatter will be unacceptable. Projectors will reduce that problem a lot, but at the expense of light output. If the emitter isn't in exactly the right spot, you end up with what is called a bench focus problem, where the field of light isn't even (see graphic below).



So just be aware that not all LED retrofits are created equally.
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