1. What does "+30%, +40%, +50%, +60%" that some manufacturers claim for their halogen bulbs?
This series of statements is the result of a major game of misinformation and misconceptions perpetrated by the manufacturers of lamps, with the complicity of some journalists' simple-minded: they do not regard these increases the amount of light (luminous flux, ergo lumens) emitted by the bulbs, but are reported only for the main beam is only for the luminance measured at 75 meters, with both lamps in operation.
This means, for a lamp declared "+50%", a reference area located 75 meters from the headlight of your car, in the conditions (not) declared from the house, reflecting 50% more light than in the case use of standard lamps.
Want proof? The Osram Silverstar deliver the same lumen output of the Osram Super, and while the former is declared a "+50%" is the second declared "+30%" (remember that this increase is related to the pair of lamps, not to a single light bulb) . In the "dazzling", both of these bulbs emit a luminous flux of only 3% higher than a normal bulb H4 , so the pair delivers a luminous flux of only 6% higher.
This meaning given by the manufacturers to the concept of "X +%" not at all explained either in blister containing bulbs, or in advertising material issued by the manufacturers themselves.
The only cases of clear explanation of this concept, I found the websites of the manufacturers, only the site of Hella New Zealand [1] and on the website of the Indian manufacturer Phoenix [2].
Honor for their honesty.
cmq The concept is explained both on AutoExpress [3] and is either on the FAQ of IDA [4].
reconsider the Osram Silverstar and Super: as the luminous flux emitted is the same, reflecting the fact that an area in one case 1.5 times the incident light and 1.3-fold in the case mean that somewhere in the luminous flux will be reduced. Said the other words because the light emitted is always, how do you get a higher luminance at a given point in space?
The reason is easily explained. The product standard bulbs (see below) requires that the dimensional requirements are not as "tight", because ultimately the filament is placed inside the focal point of the parable of the lighthouse, dimensional tolerances of the parable itself, tolerances position and geometry of the filament shape of the cap of the filament of the beam, together play the game of the efficiency of the lamp-reflector for both the beam ana / that beam.
so happens that manufacturers of light bulbs are able to change the bulb-reflector coupling photometric curves, "alleviating" some areas and "loading" other areas.
pity that these test conditions are not declared. Philips even in its official press release for the Vision Plus [5] states:
"... However, These Percentages May Vary with the type of headlight in use"
or in other words that the increase in luminance 75 m (ergo the famous "+30%" or "+50%") CAN 'vary according to the state of use of parables and of the same type.
Even in the Italian publication for the Osram Silverstar said [6]:
"Up to 50% more light *"
and foot of the page reads:
"(*) Depending on the efficiency of the parable"
In However, manufacturers of light bulbs do not specify on which the fire is optimized reflector / beam geometry. As further confirmation of the first espresso, if one was not yet convinced, if a lamp from the +50% it should always give, or not? What the central state of use of the parable? This
get their hands on the part of manufacturers shows that the concept of luminance there are playing.
E 'is therefore likely that the combination bulb-parable in some areas lead to light levels at the lower limit for acceptable legislation.
Even the few "road tests" found on the Internet for a scientific sin. The test on AutoExpress H7 is highly questionable [7].
A serious test it must include:
- analysis of light from several different batches (also to check the consistency of quality in production)
- analysis of different types of dishes (since the car manufacturers now have only parables "free form" does not necessarily accept lamps with different classes of tolerance dimensional)
Even the lighting efficiency rankings compiled by AutoExpress, by failing to specify the parables of testing, leaving the time they find.
Expressed in other words, it is quite likely that any given dish is not said that the "+50%" 75 meters you can find it.
closing the opening statements, if a lamp is declared "+30%" means that the luminance at 75 meters is 1.3 times as compared to the standard lamp and so on for the "+60%" [editor's note is not an error, there is the General Electric Megalight Plus].
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2. How much light emitting H4 bulb approved?
We must consider that there is a H4 European Union (our own) and there is a H4 America (PIAA, Raybrig, noky etc).
Bulbs H4 should be subject to the product standard, which defines both the dimensional aspects, and functional aspects (absorption, durability, light emitted).
In Europe, product standards are the ECE Regulation 37, which originates on the lamps, the brand E * (E1 = ad.es. which approved the lamp manufacturer in Germany).
In North America the related product standards are the SAE HS-34 and FMVSS108 (Federal Motor Vehicle Safety Standard 10 and originate with the symbol "DOT SAE.
worldwide instead rules on the duration of the lamps are IEC809 and 810.
According to European standards ECE -R37, a lamp H4 any, of a type approved for road use, it emits a luminous flux of 1650 lumens and 1000 lumens on high beam to low beam, with tolerances of + / - 15%, at rated voltage test of 13.2 V. This finding may occur also by analyzing the catalogs of all manufacturers of approved E * bulbs that provide the data sheet.
therefore declared approved a light bulb in Europe, the test voltage of 13.2 V, may not issue, considering the tolerance, more than:
1.15 * 1650 = 1900 lumens for dazzling
1.15 * 1000 = 1150 lumens for the low beam
accordance with American standards and SAE HS FMVSS108 -34, the value of the luminous flux for lamps H4 (in North America are also classified as 9003 or HB2 [8]) for road use is 1500/910 lumen abba / ana + / - 15%, the rated voltage of 12.8 V
time
To compare European H4 with H4 American, we must express the value of luminous flux equal tension.
At constant voltage (see later the source of salary), from 12.8 to 13.2 V the voltage increases by 3%, while the luminous flux increases by ~ 11%, so a light bulb declared approved in North America and Canada, if the voltage fed European test of the lamps, emits a stream Rated:
1.11 * 1500 = 1665 lumens + / -15% for the beam and
1.11 * 900 = 999 lumens + / -15% for the low beam (rounded in 1000!)
therefore declared approved a light bulb in North America and Canada, if they can not issue to 13.2 V, whereas tolerance, more than:
1.15 * 1665 = 1915 lumens for dazzling
1.15 * 999 = 1148 lumens for the low beam
This value does not tell you anything? It seems as if the filaments of the H4 U.S. are the same as H4 Europe, as the conversion factor due to the different supply voltage makes the same as the light emitted at 13.2 V.
This result is very important: all lamps marked "DOT SAE", as approved in the North American market (hence the different H4 PIAA, Raybrig, noky etc) may not exceed the values \u200b\u200bof emission of luminous flux.
As can be seen also, for the same supply voltage of 13.2 V, the maximum luminous flux emitted by a European H4 is almost equal to that emitted by a H4 "American."
could not be otherwise, because if H4 eg. PIAA emit a luminous flux of more then:
a) would not be approved in North America and Canada
b) PIAA itself has all his interest to publicize the value of light emitted. PIAA
fact (as well as Raybrig, noky etc) NOT recites the value of lumens emitted from their bulbs!
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3. Among the manufacturers considered as a H4 bulb by 60/55W emits more light according to data reported?
Since we were able to infer the light emitted by a H4 standard American powered to 13.2 V (slightly "overdriven" as the test voltage is 12.8 V in America), we can draw the following ranking (main / dipped): 1 ^
Philips Vision Plus 1895/1150 lumens max 2 ^
Philips Premium 1815/1100 lumens +4 / -15% 4 ^
Osram Silverstar 1700/1075 lumens +7 / -7%
4 ^ Osram Super 1700/1075 lumens +7 / -7% 4 ^
Osram Allseason 1700/1000 lumens + -10% / 5 ^ + -7%
H4 American standards 1665/1000 lumen +15 / -15% 6 ^
Osram Cool Blue 1650/1000 lumens +15 / -15% Philips
BlueVision 1650/1000 lumens +15 / -15%
Osram Light @ Day 1650/1000 lumens +15 / -15 %
WeatherVision Philips 1650/1000 lumens +15 / -15% Philips
Longerlife 1650/1000 lumens +15 / -15% General Electric
EuroBlue 1650/1000 lumens +15 / -15%
Osram normal lumen 1650/1000 + - 15% / 12% + lumen
Phoenix 1650/1000 [nb for all H4] H4
standard EUROPEAN 1650/1000 lumens +15 / -15%
PLEASE NOTE: DOT SAE H4 stamped, approved in North America and Canada, can not be used for road traffic in Europe. These are among the various PIAA, Raybrig, noky etc.
Hella and General Electric products which are classified as "+30%" and "+50%" GE also has a "+60%" and all these manufacturers, however, do not declare the technical data.
The real differences between the lamps, since we have a range of values \u200b\u200bwithin which they are approved, they make the manufacturing tolerances.
We should note that the Philips VisionPlus from the data in a somewhat 'naughty, why does not represent the tolerance for the emitted flux but the maximum flow. If we look at the premium and only going to give maximum flow statistics, we have 1.04 * 1815 = 1887 lumens. This means giving the value of flow for the two lamps in the same way we write 1895 Vision Plus, Premium 1887 lumens. If we look
these data explain why many here say the upgrade with these lamps is more psychological than real: having these values, the true lumen of the real increase compared to a standard bulb (not counting the VisionPlus because it is expressed in a "fluffy ") is as follows (abba / dipped):
Philips Premium +10% / +10% Osram Silverstar
+3% / +7.5%
Osram Super +3% / +7.5%
Osram Allseason + 3% / 0
H4 American +1% / 0 [ie. PIAA, Raybrig, etc]
One last chance that you could give the PIAA might be this: the top of the range of Osram and Philips, while coming in the range of approval, by virtue of any selection in the upper part, to limit the maximum allowed. Moreover, these lamps have a manufacturing tolerance of tighter standards, so even if we buy a couple not very lucky, you know in advance that you will lose at most 7% in the case of Osram.
may be also, but to prove, that maybe PIAA behave like the Philips Vision Plus, or after a "fierce" selection on the market are made with only the light flux emitted close to the maximum allowed. But this is unproven. In any case, for statistics, even a normal pair of H4 € 4 may emit more light than a pair of PIAA.
All other H4 mentioned in paragraph 3 emit the same light as a light bulb H4 standard (and therefore the various CoolBlue BlueVision just add anything more as visibility!)
In reality, since we have a pair of headlights, increasing the illumination at the front, where the contribution of the two lamps are combined, is clearly superior to that of the previous table.
also analyzing this data we find that is not true that
PhilipsVisionPlus = Osram Silverstar
nor that
Osram Philips Premium = Super.
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4. How important is advertising suggestion?
The answer is "much" or "very much". Indeed, we have seen that the luminous flux is confined within a band of approval. We have also seen that the range of European approval reaches the same values \u200b\u200bof the range of American values, once the "correct" the flux emitted by the lamps to consider the American-operated lights instead of 13.2 V to 12.8 V.
E 'certain (so pretty sure) that a European lamp emits more lamplight U.S. TO THEIR voltages.
lamps used in Europe H4 American overwattate these are, in fact, as they are made to work at a supply voltage higher than approved.
repeat again the comparison with the same supply voltage (13.2 V):
H4 low beam headlights
(lumens) (lumens) European
1650 + / - 15% 1000 + / - 15%
American 1665 + / - 15% 1000 + / - 15%
Then when you install for road use (not legally) a pair of H4 bulbs American nominally we only increase the luminous flux of 15 lumens on high beam.
each evaluation in conscience if the price you pay for the 15 lumens is convenient.
But we must also consider that in a coupled lamp-reflector, the same luminous flux emitted, the only difference is the precision with which the filament provides the flow of light inside it, so much the better if it was placed at the precise point focal length. There are no other issues to consider!
Keep in mind that the values \u200b\u200bof the light emitted shall be valid only for new lamps. The manufacturer (Philips is the No. 1 here as honesty in declaring the data) should also disclose the amount of flux emitted in% to 75% of useful life of the bulb. Well for example, after 120 hours on a life of 150, a light bulb emits more or less than 85% of the initial flux. This means that all the comparisons that are made when you change the light bulbs should be carried out with reference to new bulbs.
For PIAA then touching the paradox. AutoExpress also in its tests [9] has verified that the various PIAA H7 Super White H7 emit even less light than the normal (measured by spectrophotometer). The fact that the sight of the lantern is satisfying, a nice bright white ice, does not lead to the test instrument, any practical advantage.
Even the test of another portal to American Auto Accessories [8] has occurred on a Honda Civic the "PIAA Super White" and "Opti Blue Super White" and has compared with the original lamps (OEM) and the "Astra" made in Taiwan. The test showed instrumental to 100 feet (30 meters) with a value of illumination equal to the PIAA -16% compared with the first installation of the lamps. It should be said that even in this trial was tested in more than a few copies of bulb.
Certainly when you spend more than € 100 for a pair of Super Plasma GT has many influences to believe that the increase is real. I remember that in many, in various Italian and European NG, in the past expressed some concerns about the PIAA, just saying that the increase is more psychological than real. Crossing the data and some deduction, we have shown you why!
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5. If I wanted to compare these lamps regular H4 with H4 enhanced and discharge lamps (HID), which is the comparison in terms of light output, just to understand orders of magnitude?
1 ^ Osram D2S HID 3200 lumens + / - 15% 2 ^
Osram D2R HID 2800 lumen + / - 16% 3 ^
Philips Rally 100/90W 2900/1700 lumens + / - 15% 4 ^
H4 Osram 100/80W 2900/1500 lumens + / - 15% 5 ^
Phoenix normal 130/90 2880/2280 lumen + / - 6 ^ nd
Phoenix 100/90W normal 2400/1900 lumens + / - 7 ^ nd
Phoenix 100/80W normal 2400/1900 lumens + / - 8 ^ nd
Phoenix 100/55W normal lumen 2400/1000 + / - 9 ^ nd
Philips Vision Plus 1895/1150 lumens max
10 ^ Philips Premium 1815/1100 lumens +4 / -15% 11 ^
Osram Silverstar 1700/1075 lumens +7 / -7%
Osram Super 12 ^ 1700 / 1075 lumens +7 / -7% 13 ^
Osram Allseason lumen 1700/1000 + -10% / 14 ^ + -7%
H4 standard AMERICAN 1665/1000 lumens +15 / -15% 15 ^
European standard H4 1650/1000 + / - 15% 15 ^
Osram Cool Blue 1650/1000 lumens +15 / -15%
16 ^ BlueVision Philips 1650/1000 lumens +15 / -15% 16 ^
Osram Light @ Day 1650/1000 lumens +15 / -15% 16 ^
WeatherVision Philips 1650/1000 lumens +15 / -15% 16 ^
Philips Longerlife 1650/1000 lumens +15 / -15% 16 ^
General Electric EuroBlue 1650/1000 lumens +15 / -15% 16 ^
Osram normal lumen 1650/1000 + -15% / -12% + 16 ^
Phoenix 1650 / 1000 lumens [nb for all types of H4 ]
Note: To Phoenix via the types allseason, blue & bluwhite, XL, the flow emitted will not change.
Note that Philips produces good lighting enhanced.
In this table we see is really tempted to install the lamps H4 100/55W: use with low beam is a H4 normal up as I get a +75% real beam of light the bulb more! Too bad this is not legal!
Side note: Many manufacturers have the 100/55, I mentioned the Phoenix as an example only.
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6. But at a higher luminous flux emitted by the lamps is a real improvement of enlightenment?
Unfortunately it is not said. Plays a major role in the geometrical factor: if the position of the filament is not in the actual focal point of the parable, so we have a great flow, which But it is not "in focus" gives rise to an imperfect beam geometry, then "scollimato", which nullifies any surplus flow of light available.
prime example is the case of the test conducted by AutoExpress H7: one of the lamps with lower light emitted will be revealed to the photometric test as one of the best sign of a great precision in manufacturing [7], or a blow of luck for which the coupled lamp - reflector was optically and geometrically perfect.
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7. For a higher color temperature, or light shade with white-oriented "Ice Age" is an actual better visibility?
On this point, all manufacturers will deny, otherwise they could not sell at the same time, the lamps light "ice age" (BlueVision, CoolBlue etc) and those with light "soft" (WeatherVision, Allseason etc.), And support vehemently opposed reasons.
The only landmark is that the human eye is most sensitive to a yellow color around the green (I'll spare you the wavelength). The higher up or down with the color temperature than this wavelength, less than the human eye's sensitivity.
Compared to the color temperature of a H4 standard (3,200 K), therefore the higher the color temperature, light intensity should be increased to give the same subjective feeling of illumination. Then a light bulb such as "Ice Age" is to deliver much more light than a light bulb "normal" so that the eye perceives the same value of illumination (note that the luminous flux in lumens takes into account the different sensitivity to the human eye various wavelengths, or ultimately to the different color temperatures). This also explains why typically a lamp of this type (blue *) has a shorter duration than that emits light rather "normal" to provide more light than the filament is made to work at higher temperatures, and with shorter duration. This phenomenon is very evident in the Osram Cool Blue. For Philips instead there is a longer life because the manufacturing technology is different.
should also be noted that the use of light, "tending" to blue, produced by many manufacturers of lamps with dichroic filter but not with colored glass, is detrimental and counterproductive for the following reasons:
- scattering than light color blue, or greater tendency to spread. In the event of fog or rain, the spread of blue light is greater than that of lamps "allseason, which have a tendency to yellow spectral oriented. In fact, if you have something to do with lots of fog, lamps with light "yellow" are recommended as "penetration" of the light yellow is known to be oriented more.
- reduced visibility for drivers that come in the opposite direction: the light blue does not stimulate sufficiently oriented to the contraction of the pupil, causing a momentary glare for those coming from the opposite direction. This may explain why a beam-oriented blue tones seem to be brighter than a beam of white has kept open most of the apple! You also must verify the evidence that the pupil is less sensitive to blue light stimulation: two documents prepared in word format the same color and font / background with black characters page white and then the same page document with black and blue type, and displayed in full screen, alternating them. You will find that there is a noticeable eye strain to focus on the characters in blue.
-HID lamps emit light in blue component of which is still accompanied by a good dose of "white" light, so this phenomenon is felt in particular, who has heavily colored lamps with blue glass (not the case Cool Blue Osram and Philips BlueVision) instead has a good blue light component oriented. Lamps with blue glass which are not dichroic filter emit less light than a lamp "normal."
These considerations, along with many other little things interesting, you can further here [10], [11] and [12].
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8. Some manufacturer claims without further clarify things like "60/55W = 135/125W. What does this mean? These manufacturers should
honesty to point out that the meaning of these statements is as follows: "since the more powerful a light bulb, the greater the" brightness "[esoteric term that means nothing in lighting but it leads to suggestions that Ed], the My bulb is as bright as a 60W to 135W. STOP. NOT MEAN THAT THE FLUX AND 'a light bulb of 130W!.
The Sylvania Silverstar, ergo the relative of Osram Silverstar in North America, willingly abusing the concept of brightness. We read together here [13]:
"SYLVANIA's SilverStar halogen headlights are the brightest, 100% street legal halogen on the road-burning cleaner and crisper, with a white-hot intensity That Will Set You and your machine apart. SilverStar headlights are That the halogens only capture the high performance look of HID, changing your view of the night. "
If we then read the data sheet of the Sylvania Silverstar [13], we? The usual 1500/910 lumens. A vulgar
H4 "standard" of General Electric DOT SAE marked, for the American market, it delivers the same lumen 1500/910 (it model 9003) [15].
E 'is therefore clear misunderstanding of the game?
A constructor acts as more serious (Raybrig) [16]:
"You show the brightness impression of class 100/90W Consumption by electric power of the normal valve 60/55W equal."
In practice working on the operating temperature of the filament, the gas mixture, the dichroic filter more or less, the light has a color temperature of higher than normal, so as to treat, for this aspect, that of a bulb more powerful one.
The fact that these PIAA bulbs are DOT stamped SAE and then "street legal for North America and Canada" shown by the fact that the emitted flux is the same as a H4 American standard, or 1500/910 lumen to 12.8 V Power!
Here again confirmed the power of suggestion of advertising! As he said (and still says) Beppe Grillo, <<...abbiate dubbi !!>>!
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9. Who builds the lamps with the light more "ice" and other people of color temperature lamps?
The color temperature declared by the manufacturers for model H4 are
color sunlight 5400 [more or less standard]
PIAA Super Plasma GT 4200/5000 Kelvin (abba / ANAB)
PIAA Xtreme White 4150 Kelvin 4000 Kelvin
Philips Blue Vision [new model] Osram Cool Blue
4000 Kelvin [new model]
PIAA Super Xtreme 3950/4200 Kelvin (abba / ANAB)
PIAA Platinum Super White 3800 Kelvin
PIAA Super Plasma 3800/5000 Kelvin (abba / ANAB)
EuroBlue General Electric Osram Cool Blue
3700 Kelvin 3700 Kelvin [older model]
Philips Blue Vision 3600 Kelvin [older model]
standard H4 3200 Kelvin (typical)
Philips Premium 3200 Kelvin 2900 Kelvin
ALLWEATHER
Philips PIAA Ion Yellow 2300 Kelvin
seems clear that, unmasked by the light emitted is equal to the PIAA lamps European H4, whereas the color temperature is not absolutely worth installing the PIAA [17] SuperXtreme or Super White Platinum by installing the Cool Blue Osram or Philips Blue Vision obtain a luminous flux and a temperature of roughly equal color greater for high beam, and only 200 K lower in the case of low beam for Super Xtreme, all with a considerable saving of €.
undeniable superiority instead for the shades of light emitted by the Super Plasma GT.
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10. What is the lifespan of the bulbs?
The lifespan of the bulbs can be defined by IEC810 standard with two parameters: B3 and Tc.
-B3 is the average useful life of more than 3% of light bulbs that "burn out" first;
-Tc is the average useful life for 63.2% of light bulbs that "burn" for the first (63.2 1-1% is out of operation / e, where e = 2.71828, natural logarithm).
Sometimes, especially for the American market, is expressed as a B50 life, which is the average of 50% of light bulbs that "burn out" first.
Who wants to learn these details, this is not required, see the Italian Osram catalog on page 39 [18] or take a look here [19].
The declared values \u200b\u200bare expressed in hours per abba B3 / B3anab - abba Tc / Tc dipped, classified according to life of Tc-beam headlamps, which is the parameter most significant use:
[Note: General Electric, and Phoenix is \u200b\u200bas B50]
Osram Light @ Day 250/500 - 300/500 1200/3000
Osram Longlife - 1100/2400
Longerlife Philips 900/900 - 1500/1500
Osram normal 250/500 - 400/900 General Electric
normal 225 to 900
WeatherVision Philips 350/350 - Philips BlueVision
700/700 150/150 - 400 / 400
Phoenix 60/55W normal 150 to 300
Philips Vision Plus 200/200 - 350/350
Osram Silverstar 150/150 - 350/350 150/150 Super
Osram - Osram Allseason
350/350 150/150 - 350 / Osram Cool Blue 350
50/100 - 150/350 Premium
Philips 150/150 - 250/250
Phoenix 100/90W normal 100 to 200
Osram H4 100/80W 75/75 - 150/150
Philips H4 rally 100/90W 40/40 - 100/100
Just for comparison: Osram D2S
1500-3000 (HID lamp, B3 / Tc)
We make comparisons between lamps "homogeneous" by type:
-lamps "+50%"
-> Philips Vision Plus 1 ^ 200/200 - 350/350
2 ^ Osram Silverstar 150/150 - 350/350
-lamps "+30%"
-> 1 ^ Osram Super 150/150 - 350/350
2 ^ Premium Philips 150/150 - 250/250
-light lamps "Ice Age"
-> 1 ^ BlueVision Philips 150/150 - 400/400
Osram Cool Blue 2 ^ 50/100 - 150/350
-lamps "all season"
-> 1 ^ WeatherVision Philips 350/350 - 700/700
2 ^ Osram Allseason 150/150 - 350/350
-lamps "long life"
-> 1 ^ Osram Longlife 300/500 - 1100/2400
2 ^ Longerlife Philips 900/900 - 1500/1500
-powered lamps (100W)
-> 1 ^ H4 Osram 100/80W 75/75 - 150/150
2 ^ H4 Philips rally 100/90W 40/40 - 100/100
To close the speech on the duration of DOT SAE H4 marked (PIAA, Raybrig, noky etc) we will see shortly that overwattandole in fact a 3% (rising from 12.8 to 13.2 volts for U.S. approval with which the ns. Auto plants are more or less get on the lamps), is reduced to 70 % the length of the lamps.
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11. Concluding Remarks
E 'Clearly, if we consider only the amount of light for a H4 60/55W, the choice falls however on most performing Philips Vision Plus or Premium, and indeed these two are the same statistically as a stream emitted when considering also the cost aspect, the choice appears Premium the best. This consideration is based solely on technical data is entirely consistent with many interventions NG Italian, where several times he showed a certain superiority of Philips Premium / VisionPlus to the products.
Perhaps, with technical data to be verified, including General Electric Megalight could tell her. It seems that Bosch produces a H4 bulb Approval Declaration "+60%". I do not think, however, have never seen opinions on these two lamps.
taking any H4 approved in America (not just PIAA, but even such a trivial General Electric or Sylvania), just as overwattate car use on our plants, we get a light emitted from these Same as any European lamp.
If we are interested in a light "ice age" beats the Philips Blue Vision, Osram Cool Blue just as the best term, all other parameters are equal (color temperature, flow has been issued).
If we want a lamp with a whiter light ever since the PIAA Super Plasma GT is the product you are looking for.
If we are interested in a soft light, Philips, Osram Allseason WeatherVision beats as the best time, the flow emitted light is in favor for the headlights Osram (1700 vs. 1650 lumens). Osram also said the technology Allseason "+30%".
If we are interested in a lamp "long life" beats the Philips, Osram Longlife Longerlife as duration, the flow emitted is the same for both.
If we are interested in a lamp such as "daylight", Osram Light @ day is far better than even the long life!
However, the great moral that is drawn is that there's absolutely worth changing light bulbs, except for:
- provide lamps that emit a stream near the maximum limit for approval then to the Philips VisionPlus / Premium
- have a color temperature of "rewarding".
We then demonstrated, considering objective technical data and deductions, the considerations expressed several times in different posts in the NG, or that driven by the search for better performing lights, change light bulbs does nothing but lighten your wallet, and that improvements are really noticeable is only going to the H4 type enhanced.
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