what is the difference between a h1 and h7 headlight bulb?
142352
different socket sizes
749696
http://www.rei.com/online/store/Search?storeId=8000&crumb=%26quot%3Bheadlamp%26quot%3B%5E%26orig%3Dheadlamps%26noalias%3D1%26cat%3D4500058%26query%3Dheadlamp%7EHeadlamps%5E%26cat%3D4500596&orig=headlamps&noalias=1&cat=4500596&query=headlamp&vcat=REI_SEARCH:N\nhttp://www.campmor.com/webapp/wcs/stores/servlet/CategoryDisplay?catalogId=40000000226&storeId=226&categoryId=260&langId=-1&parent_category_rn=241
928685
An electric INCANDSCENT bulb uses a tungstene filament (twisted wire) that is heated by the current passing through to several hundred degrees.  It is this heat that heats the glass.  It is also the proof of inefficiency of the bulb, because it is transforming 80% of the energy it receives into heat, giving only 20% for light!\nIn the FLUORESCENT tubes, the light is produced by the ionisation of the internal gas (neon or argon).  This ionisation is initiated by heating two small filaments at teach end of the tube, that heat up a small drop of mercury.  Once the mercury is vaporised inside the tube, the "starter" opens, creating a high voltage puls across the whole tube, ionising the gas that then becomes conductor: a small current passes through the gas, and the filaments are disconnected.  Since the ionised and conductive gas has nearly no resistance, the current is limited by the "ballast" (an inductor inserted in series).\nSince the CURRENT is limited, there is no "Joule Effect" (heating) and the tube stays pretty cool.\nTheir efficiency is about 100 times more than a bulb... (in terms of power/light ratio).
629262
http://en.wikipedia.org/wiki/Light_bulb#History_of_the_light_bulb
172088
I know the new Mercury and Lincoln vehicles with the LED's don't seem to flicker much, but I agree it seems that Cadillac's have a bit of flicker to them. Maybe they should put one of those epilepsy warning stickers on the back of 'em!
250943
This might help, it gave me enough info to get started on my A6....\n\nhttp://www.lotzabutta.com/html/images/car/AudiA4/DIY/headlamp/DIYa4.htm
82938
keep in mind that they have a lot of effect on your car.  A manifold is often replaced with a header. The issue with headers is 1)  Even Tube and 2) Long tube vs. Short Tube.  The next issue is catalytic converters vs. none vs. high flows.  Another issue is pipe length and diameter.  \nChanging these will have various changes on your car.  It is often misunderstood.  Most people think free flowing = more power = faster.  This is right and wrong at the same time.  These items will also control were your engine makes it's horsepower and torque within its rpm range.  You need to find out how you plan on driving, what transmission (torque (stall) converter setting) vs. standard trasmission, if you plan on racing and what type (stop light to stop light vs. quarter mile vs. rally)  these are all different and require different set ups.
195118
Newer bulbs automatically refresh their volume from the gases present in the bulbs. They used to bleed off, become thinner and burn out eaiser.
466429
A lot of "rice" cars use them, but it can be a way to improve your headlights to make them brighter, but really not needed.\n\nA good set of headlight bulbs shoudl be bright enough, especially if you upgrade to the sylvania silverstar/atravision bulbs
659337
check this thread may be helpful\nhttp://n.webring.com/hub?ring=hc11
384713
haha, your headlights are on.
8562
Just a quirk of history.  As to safety, there's really no difference.  In places where folks drive on "the other side," the driver is also "on the other side."  This means that visibility remains the same.
735946
An incandescent bulb usually has a vacuum inside. Sometimes it has argon in it. While it is on, the tungsten in the filament is evaporating from the heat until finally the filament gets so thin that it breaks and the bulb is useless.\n\nA halogen bulb includes a halogen gas in it. While it is on, the tungsten in the filament is evaporating from the very high heat that these bulbs are operating at. However tungsten vapor evaporating from the filament combines with the halogen gas so that the filament is rebuilt when the tungsten lands on it and does not burn through. That lengthens the life of the bulb and the higher temperature also gives a brighter light for the same wattage. More light, more life, less operating cost.
136891
In a HEMI engine, the top of the combustion chamber is hemispherical. The combustion area in the head is shaped like half of a sphere. An engine like this is said to have "hemispherical heads." In a HEMI head, the spark plug is normally located at the top of the combustion chamber, and the valves open on opposite sides of the combustion chamber. \nHEMI engines have all these advantages, why aren't all engines using hemispherical heads? It's because there are even better configurations available today. One thing that a hemispherical head will never have is four valves per cylinder. The valve angles would be so crazy that the head would be nearly impossible to design. Having only two valves per cylinder is not an issue in drag racing or NASCAR
38663
1 horsepower ≈ 745.700 W (rounded up from 745.69987158227022 W)
862074
If I understand you question correctly, you are putting in a retrofit fluourescent bulb into a standard lamp with a 3 setting light switch.\n\nYou are probably using power on setting #1, but there is not enough power to have the ballast convert the voltage and ignite the gas in the bulb.  But it is probably using energy constantly trying to light the bulb.  \n\nIt is a different principle than an incandescent bulb where no light = no heat = no power.\n\nI am not a total expert on the retrofit bulbs, but I would say if it is humming and the base above the socket warms up, it is using power.
2312
Yes. "A person shall not operate a motor vehicle with a colored transparent or translucent substance or material installed, affixed or applied on or in front of the head lamps, the auxiliary driving lamp or the auxiliary passing lamp or combinations of the head lamps, driving lamp or passing lamp that would obstruct, reduce or interfere with the visibility or effectiveness of the head lamps or that would change the color of light emitted. This paragraph does not prohibit the placement of clear transparent material mounted in front of the head lamps, fog lamps or auxiliary driving lamps."