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Old 01-14-2015, 04:06 PM
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Re: Replacement HIDs, 11 Overland

We do have a few options for D1S. The factory bulbs are 4300K which is the brightest color temperature. It does have a little bit of yellow in it which some people don't like. The 5000K is more of a pure white color. You will start seeing more blue in the light once you get to the 6000K range. You do get less light the higher you go in color temperature.

John

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Old 01-14-2015, 05:36 PM
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Re: Replacement HIDs, 11 Overland

Quote:
Originally Posted by XenonDepot View Post
We do have a few options for D1S. The factory bulbs are 4300K which is the brightest color temperature. It does have a little bit of yellow in it which some people don't like. The 5000K is more of a pure white color. You will start seeing more blue in the light once you get to the 6000K range. You do get less light the higher you go in color temperature.

John
I already found some stuff. But to correct you, you only get MORE light with lower color temps according to lumen meters. The human eye gets more visible light with whiter colors like 5k-6k.

That's why it's easier to see in a Walmart parking lot lit up with white metal halide bulbs versus a Home Depot parking lot lit up with orange high pressure sodium bulbs.

Also why all the NEW led stuff coming out for security lighting and parking lot lighting and exterior lighting in general is more of a pure white.
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Old 01-14-2015, 09:48 PM
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Re: Replacement HIDs, 11 Overland

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Originally Posted by floon34 View Post
I already found some stuff. But to correct you, you only get MORE light with lower color temps according to lumen meters. The human eye gets more visible light with whiter colors like 5k-6k.
Not exactly. At higher color temperatures the brain INTERPRETS the light as brighter because of the greater content of light in the blue part of the visible spectrum. The eye isn't actually receiving more light -- the meters are completely correct. Additionally, although you are interpreting the scene as "brighter" due to the blue content in the spectrum, several aspects of visual acuity diminish including contrast interpretation and color replication.

Quote:
That's why it's easier to see in a Walmart parking lot lit up with white metal halide bulbs versus a Home Depot parking lot lit up with orange high pressure sodium bulbs.
Actually, you only THINK it's easier to see because you are "trained" to think that bright (according to your eyes) = better. In reality, you're actually losing more and more important visual information as the color temperature of the light source increases above 4500K.

Quote:
Also why all the NEW led stuff coming out for security lighting and parking lot lighting and exterior lighting in general is more of a pure white.

Ever wonder why there are specialized glasses (eg, "blublockers") and the sort? Wide-spectrum light isn't necessarily better. A lot of marketing hype has taken a hold of this segment--based on some very basic misunderstandings about how the eye works. It's very unfortunate.
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Old 01-14-2015, 11:31 PM
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Red face Re: Replacement HIDs, 11 Overland

Quote:
Originally Posted by Peter_K View Post
Not exactly. At higher color temperatures the brain INTERPRETS the light as brighter because of the greater content of light in the blue part of the visible spectrum. The eye isn't actually receiving more light -- the meters are completely correct. Additionally, although you are interpreting the scene as "brighter" due to the blue content in the spectrum, several aspects of visual acuity diminish including contrast interpretation and color replication.



Actually, you only THINK it's easier to see because you are "trained" to think that bright (according to your eyes) = better. In reality, you're actually losing more and more important visual information as the color temperature of the light source increases above 4500K.


wonder why there are specialized glasses (eg, "blublockers") and the sort? Wide-spectrum light isn't necessarily better. A lot of marketing hype has taken a hold of this segment--based on some very basic misunderstandings about how the eye works. It's very unfortunate.


we can go back and forth all you want but what really matters is what people can see at night in areas lit by different color temperature lighting. I happen to be an opthamologist (not currently practicing), and I've worked for 3 different lighting manufacturers studying how the human eye responds to light. Everything you've said is true but every test we conducted with people responding to what they can and can't see under certain lighting conditions proves that humans see better in whiter light.
Whiter light is also more visually pleasing.
Unless most of the 5,000 + subjects were lying and just saying they could see better with the white light because they THOUGHT it was brighter. Most tests conducted however involved most subjects only being subjected to one light temperature and asked to respond only when they could see an object or movement. It was clear cut that white light produced the most reaction.

Anyway, all I really wanted to know was what the official color temperature of the factory HIDs were so I could get fogs and DTRL to match.
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Old 01-15-2015, 11:04 AM
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Re: Replacement HIDs, 11 Overland

Official color would be 4300k D1S HID bulbs.
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