Author Topic: Led color temperature problem  (Read 1943 times)

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Offline MesharyHDTopic starter

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Led color temperature problem
« on: May 09, 2018, 06:43:50 am »
Hello eev community
I'm having problem to find the color temperature for this devices like the nokia 8850 or the ipob mini. (picture attachment for color reference)
1
https://pre00.deviantart.net/2dad/th/pre/f/2016/226/6/5/nokia_8850_by_redfield_1982-d89ydsx.png

2
https://www.gadgetmenders.com/images/64gb-ipod-mini-silver-2nd-gen-ssd-flash-upgrade-new-battery-wolfson-dac-30gb-3.jpg

I have tried to get my led's from AliExpress which some sellers claimed to be cool white but it wasn't.

Can anyone help me to finde these rare smd LED's 1206 0805
 

Offline ogden

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Re: Led color temperature problem
« Reply #1 on: May 09, 2018, 07:07:42 am »
 
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Offline MesharyHDTopic starter

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Re: Led color temperature problem
« Reply #2 on: May 09, 2018, 07:22:56 am »
i have looked into the led's specification from the link you gave me i could not find one listed as 10000k color temperature
 

Offline MesharyHDTopic starter

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Re: Led color temperature problem
« Reply #3 on: May 09, 2018, 07:53:39 am »
I just have understand this led is determined by X and Y coordinates so I think this is more accurate way to point the colour temperature on a graph

 

Offline ogden

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Re: Led color temperature problem
« Reply #4 on: May 09, 2018, 02:51:02 pm »
i have looked into the led's specification from the link you gave me i could not find one listed as 10000k color temperature

That link was more about places where you can look for LED's that one particular LED I searched for.
 
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Offline Jwillis

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Re: Led color temperature problem
« Reply #5 on: May 10, 2018, 04:14:17 am »
LEDs are normally rated in nano meters of the band width of light they emit .On the visible spectrum red is  the lowest at 620 < λ < 645 nano meters and blue the highest at 460 < λ < 490 nano meters.Although we can't see UV light it does enhance brilliance to the broad spectrum .White leds are a broad spectrum  of either  Blue/UV diode with yellow phosphor for Cool / Pure White or Blue diode with orange phosphor for Warm White or RGB color mixing but RGB LEDs leave gaps in the spectrum .Because of these limitations  LEDS don't have a kelvin rating .
Other sources of light like halogens can be adjusted very finely by changing the amounts of various gases to achieve varying warmth's hence a broad range in kelvins.   
 
 
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Offline MesharyHDTopic starter

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Re: Led color temperature problem
« Reply #6 on: May 10, 2018, 04:56:00 am »
LEDs are normally rated in nano meters of the band width of light they emit .On the visible spectrum red is  the lowest at 620 < λ < 645 nano meters and blue the highest at 460 < λ < 490 nano meters.Although we can't see UV light it does enhance brilliance to the broad spectrum .White leds are a broad spectrum  of either  Blue/UV diode with yellow phosphor for Cool / Pure White or Blue diode with orange phosphor for Warm White or RGB color mixing but RGB LEDs leave gaps in the spectrum .Because of these limitations  LEDS don't have a kelvin rating .
Other sources of light like halogens can be adjusted very finely by changing the amounts of various gases to achieve varying warmth's hence a broad range in kelvins.   

Thank you that was helpful i was looking in www.masterelectronics.com LED filter and i found they listed the Color Temperature with k and x,y values which this graph can explain it
https://upload.wikimedia.org/wikipedia/commons/thumb/b/ba/PlanckianLocus.png/1200px-PlanckianLocus.png

however i found some SMD led colors very exclusive to big tech big companies.
 


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