"Berang" (berang)
12/12/2016 at 20:59 • Filed to: None
1
5|
"Berang" (berang)
12/12/2016 at 20:59 • Filed to: None | 1
| 5 |
I decided to try out a yellow bulb in the fog light, but I’m not sure I’m sold on it.
I picked up some of these mad-tyte yellow bulbs, for that hella cool JDM look. No wait, I meant vintage look because everybody used to know fog lights had to be yellow or use yellow bulbs. Because reasons. France used to mandate all headlights use yellow bulbs, so it’s really more of a FDM look than JDM (why yellow bulbs are associated with Japan at all...
The bulb that was in the Lumax fog light was an old style H1 bulb, that I’m not even sure anybody makes anymore. It looks pretty cool though. In went the hella JDM yellow bulb.
Stock “white” bulb ^^^^ Yellow bulb VVV
It’s def more yellow and vintagey looking. But here’s why I’m not sold on it: it seems the beam focus is off now, the cut-off is fuzzier than it was with the old bulb, and I had to re-aim the lamp slight downward. Predictably it also looks a bit dimmer on the road.
Low beams only.
Low beams and fog beam.
Fog only.
Fog only with original bulb (exposure time not the same, so the difference is exaggerated, but you get the idea).
HMMM. I don’t know if I like the vintage look more than usability. At the time most fog lights would have used dyed in the mass yellow glass instead of yellow bulbs, yellow bulbs being more of a headlight thing. Indeed, Lumax offered this same model lamp with yellow glass. I don’t know if yellow glass/clear bulb would necessarily result in a brighter beam though. Nor can I rule out that maybe the difference in brightness is related to the focus of the bulb being somewhat different. ¯\_()_/¯
Internet experts, throw your spurious claims at me.
The Crazy Kanuck; RIP Oppositelock
> Berang
12/12/2016 at 21:04 |
|
You should notice the difference in rain and/or fog.
daender
> Berang
12/12/2016 at 21:46 |
|
http://www.danielsternlighting.com/tech/lights/light_color/light_color.html
I’ll let someone who’s better qualified explain it.
What is “selective yellow” light?
It is a particular kind of yellow light that was required from all road illumination lamps on vehicles in France for many years. Light appears (more or less) white when it contains a mix of all the colours—red, orange, yellow, green, blue, indigo, and violet. By removing (filtering) the blue, indigo, and violet out of white light, we get selective yellow light. It is not the same as the more orange colour called “yellow” or “amber” used for vehicle turn signals, side marker lights, and (in some countries) clearance and front position or “parking” lights.
Why and when did France require selective yellow light?
A number of folk explanations have long been in circulation for the French yellow-lights requirement that started in the mid-1930s. Some say it was a tactical decision at the urging of the military, to facilitate identification of the nationality of a vehicle at night, useful during the war. Some say it was because French road pavement had peculiar reflective properties. Some say it was nothing but market protectionism. And a particularly persistent myth holds that yellow light “penetrates fog better” because blue light scatters more, as evidenced by the sky being blue. The sky is indeed blue because of Rayleigh Scattering—short-wavelength light such as blue, indigo and violet does indeed scatter more—but only in droplets and particles equal or smaller than the wavelength of the light. That’s much smaller than the particles and droplets that make up ground-level fog, rain, and snow; there is no Rayleigh Scattering happening to the light from a vehicle’s front lamps, and whatever blue light those lamps might be producing does not get scattered by the fog, snow, or rain more than other colours of light.
What does the science say?
Some technical papers out of France on the subject can be had here and here . These are both by Pierre Devaux, a scientist and member of the CIE (International Commission on Illumination). These, particularly the 1970 paper, go into great detail about why selective yellow light might be more suitable and less glaring than white light for night driving. A 1976 study done in the Netherlands found no significant benefit to either colour over the other—an interesting result not only because it contradicted both the claims of yellow superiority, and also the counterclaims that white is better. But selective yellow lamps have consistently over the years been subjectively preferred as “better” in bad weather and lower in glare than white ones. Even now, when most of the world’s fog lamps emit white light, the “good fog lamps are yellow” idea still has traction.
So is there a real benefit? Or is it just a subjective impression? Because yellow-light requirements are no longer on the lawbooks (except in Monaco, where it is probably not enforced) we probably will never know the vagaries of the answer to this question. There are problems with drawing a conclusion from the 1936-1993 European experience with selective-yellow headlamps. For one thing, car lighting technology of that timeframe generally did not give the driver enough light—of either colour—for safe night driving. And even if we disregard that, filtering out the blue-indigo-violet reduced the absolute intensity of the beam by about 12 percent. This may have had a part in reducing the glare (though maybe not; it’s below the 15% change needed to cause an observer to see a just-noticeable difference—further discussion below).
What, then, explains the persistent subjective preference amongst experienced poor-weather drivers for selective yellow fog lamps (whether or not they happen to know that’s the name of the colour), despite decades of white fog lamp prevalence? Selective yellow light can improve a driver’s ability to see in fog or rain or snow, but not because it ‘penetrates fog better’ or ‘reflects less off droplets’. In fact it’s because of the way the human eye processes different colours of light. Blue, indigo, and violet are difficult for the human optical system to process correctly. They are the shortest visible wavelengths and tend to focus in front of our retina rather than upon it. To demonstrate this to yourself, after dark find a deep blue storefront sign or blue lights on an airport runway or something else that’s a deep blue light emitter against a dark background in the absence of white light—from any appreciable distance, it’s almost impossible for your eyes to see the blue lighted object as a sharply defined form;the edges blur. The blur effect is not present with nearby signs or lights of colours other than blue.
Blue also is a very difficult colour of light to look at; it stimulates the reaction we call glare. Within the range of allowable white light, bluer headlamps have been shown to be 46% more glaring than yellower ones for a given intensity of light — see studies here and here . So, it seems culling the blue out of the spectrum lightens the optical workload and reduces glare. For a more detailed examination of this effect with respect to driving in foul weather, see Bullough & Rea’s study on the topic.
|
Berang
> daender
12/12/2016 at 22:17 |
|
I know what it is. I just don’t think the yellow bulb works best in my application. I do have a genuine, dyed in the mass, yellow fog light. But it has a projection on the front of the lens that the SAAB’s clamshell hood rests on when open and I don’t want to break it. I think though, that this fog light would be superior to the yellow bulb behind
cbell04
> Berang
12/12/2016 at 22:33 |
|
I like the yellowness. Screw functionality. Rock it till you find a bulb that has all the right properties but the yellow is killer aesthetically.
dogisbadob
> Berang
01/08/2017 at 15:36 |
|
Nokya is junk. Try something like Osram All Season Super H1 on eBay
I’ve gotten bulbs from this seller before. The shipping is reasonably quick.