Cherokee Fog Light LED Bulbs! Several Bulb Options! New XML2 Added! Plug and Play!! - Page 7 - 2014+ Jeep Cherokee Forums
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post #61 of 83 (permalink) Old 03-28-2017, 08:15 PM
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@Diode Dynamics I don't see XP80 fog lamp bulbs in 5000k. Do you not make them, or what?



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post #62 of 83 (permalink) Old 03-29-2017, 09:11 AM Thread Starter
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@Diode Dynamics I don't see XP80 fog lamp bulbs in 5000k. Do you not make them, or what?



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We do not offer the HP48, or XP80 in a 5000K Color temperature. The XML2 is available in 5000K though!

Thank you,
Nick C.

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post #63 of 83 (permalink) Old 03-30-2017, 12:46 PM
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@Diode Dynamics Another question for you: for the LED fog lamps, is the yellow color "selective yellow" or just an ordinary shade of yellow?



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post #64 of 83 (permalink) Old 03-30-2017, 12:51 PM Thread Starter
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@Diode Dynamics Another question for you: for the LED fog lamps, is the yellow color "selective yellow" or just an ordinary shade of yellow?



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I don't understand your question friend

But they produce a 3000K Color temperature

Thanks!
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post #65 of 83 (permalink) Old 03-30-2017, 04:26 PM
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I don't understand your question friend

But they produce a 3000K Color temperature

Thanks!
Nick C.
If you take "white" light and filter out the wavelengths between blue and violet, 'selective yellow' is the result. If you don't know what it is, your company's lights probably aren't it. Also, since they are a yellow light, color temperature doesn't really apply, so it doesn't have a K number.

Since LEDs don't *actually* utilize blackbody radiation, they don't have a *true* Kelvin temperature measurement, although The CCT (correlated color temperature) is still measured in Kelvin. The CCT is just a representation of the equivalent appearance of a LED versus a true black body heated to that temperature. (For instance, a "3000K" LED is an LED whose light appears the same color as the light emitted by a piece of tungsten heated to 3000K [a little over 2700°C] such as the filament in an incandescant light bulb.)

However, the CCT is only useful for measuring light on the same color spectrum as would be naturally emitted by a black body heated to temperature. LEDs can be tinted any color you choose. So when you say the bulb emits a 3000K light, if that's accurate in any sense, that would mean it would emit a 'warm white' light, similar to what would come from a standard Maglite flashlight. Which I guess is sorta yellowish. At least compared to neutral or bright whites.

Not to go too far off on a tangent here. I'm by no means an expert on this stuff, I just thought that representing a company who makes light bulbs, this is handy stuff to know.

I was just looking for an alternative to what you have available. Although now I see you only have the yellow in XML2 anyway. And if they're as bright as you guys advertise them, they're really not safe to be using for their intended purpose, since in heavy fog all that bright light is going to be reflected back at you, making actual visibility much LOWER, instead of higher.

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post #66 of 83 (permalink) Old 03-30-2017, 04:55 PM Thread Starter
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If you take "white" light and filter out the wavelengths between blue and violet, 'selective yellow' is the result. If you don't know what it is, your company's lights probably aren't it. Also, since they are a yellow light, color temperature doesn't really apply.
Hey there, I'm Paul, one of the engineers here at Diode Dynamics. Nick asked me to help with your questions.

You initially asked whether the bulbs were selective or "ordinary" yellow, and frankly, I'm not sure what you meant either, as "ordinary" yellow, if it's really yellow, can only be physically produced by selective means with filament sources and is not too relevant when discussing LEDs. In my experience, "selective yellow" is the only yellow. But in either case, in the automotive world, selective yellow is now defined by a specific quadrant of chromaticity coordinates, not by the method by which it is acquired. It's a good thing that's the case, because "selective" as a term no longer has much meaning when you're dealing with LEDs... they don't produce a full spectrum that has to be filtered out in the first place like is necessary with filaments.

Anyway, the yellow XML2 offers a nominal chromaticity coordinate rating of .48,.46, which would indeed be considered selective yellow by SAE and ECE standards (J583 and Regulation 19, with the added white allowance for fog lamps). As more detail, they have warm white LED emitters with a yellow filter (lens). The emitters used are Z8 binned CREE XML2, which is 2700K, which is then filtered by a lens, which produces a yellow color that has a nominal 3000K CCT. The dominant wavelength is 579nm. You're correct that 2700-3500K CCT LEDs naturally have a warm white color, but yellow is possible as well, and there are even some new chips on the market that produce a yellow light naturally with specialty phosphors.

Regarding your last statement, the use and brightness of fog lamps is heavily personal opinion and is related to the physiology of vision in general. If that's your opinion, you're certainly welcome to select a different option or discontinue the use of fog lamps altogether. If you haven't already, I would recommend reading this article written by a friend of mine, Daniel Stern. There is an argument to be had that fog lamps are never of value if the goal is solely increasing visibility. https://www.danielsternlighting.com/...fog_lamps.html

Regards,
Paul
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post #67 of 83 (permalink) Old 04-26-2017, 03:51 AM
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Hello - what part number should i be looking for on fog lights for the 2017 cherokee? h11? or somethign different?
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post #68 of 83 (permalink) Old 04-26-2017, 09:08 AM Thread Starter
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Hello - what part number should i be looking for on fog lights for the 2017 cherokee? h11? or somethign different?
Thank you for asking!

The 2017 should still use the same H11 as the previous model years. If you have a Trailhawk, it will use a PSX24W.

If you have any additional questions or need more information, please feel free to give us a call: (314) 205-3033

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post #69 of 83 (permalink) Old 04-26-2017, 10:39 AM
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Hey there, I'm Paul, one of the engineers here at Diode Dynamics. Nick asked me to help with your questions.

You initially asked whether the bulbs were selective or "ordinary" yellow, and frankly, I'm not sure what you meant either, as "ordinary" yellow, if it's really yellow, can only be physically produced by selective means with filament sources and is not too relevant when discussing LEDs. In my experience, "selective yellow" is the only yellow. But in either case, in the automotive world, selective yellow is now defined by a specific quadrant of chromaticity coordinates, not by the method by which it is acquired. It's a good thing that's the case, because "selective" as a term no longer has much meaning when you're dealing with LEDs... they don't produce a full spectrum that has to be filtered out in the first place like is necessary with filaments.

Anyway, the yellow XML2 offers a nominal chromaticity coordinate rating of .48,.46, which would indeed be considered selective yellow by SAE and ECE standards (J583 and Regulation 19, with the added white allowance for fog lamps). As more detail, they have warm white LED emitters with a yellow filter (lens). The emitters used are Z8 binned CREE XML2, which is 2700K, which is then filtered by a lens, which produces a yellow color that has a nominal 3000K CCT. The dominant wavelength is 579nm. You're correct that 2700-3500K CCT LEDs naturally have a warm white color, but yellow is possible as well, and there are even some new chips on the market that produce a yellow light naturally with specialty phosphors.

Regarding your last statement, the use and brightness of fog lamps is heavily personal opinion and is related to the physiology of vision in general. If that's your opinion, you're certainly welcome to select a different option or discontinue the use of fog lamps altogether. If you haven't already, I would recommend reading this article written by a friend of mine, Daniel Stern. There is an argument to be had that fog lamps are never of value if the goal is solely increasing visibility. https://www.danielsternlighting.com/...fog_lamps.html

Regards,
Paul
I had missed this post from almost a month ago. I'm glad I saw it today.

Thank you Paul for posting that information. I was able to decode almost half of it, which is great

Seriously though... a big thank you for that Daniel Stern link. Coming from an engineer, it will have much more of an impact, hopefully... because I'm facing a steep uphill battle when it comes to discussing the *use* of fog lights... haha.

Keep up the great work
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post #70 of 83 (permalink) Old 04-27-2017, 11:54 PM
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i am about to place an order... do you guys do next day shipping? i am trying to get these on saturday. i will pay the difference.
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