Cree XP-G color

125mph · 04/18/2011, 09:35 PM

Hi guys,

A quick question.. I know the LED color spectrum changes based on how you dim the lights. The Cree XP-G (R2) cool whites are rated at 5000K. (http://ledsupply.com/creexpg-w354.php). If you run this LED at the rated 1000mA, will the color be 5000K?

I doc sheet is confusing (http://ledsupply.com/docs/XLampXP-G-1.pdf) but it appears if the LED is run at 350mA produces 5000K? Assuming they run at 5000K color, what happens to the color if you dim them.. Does the color get lower like 3000K?

nanojg · 04/19/2011, 04:33 AM

They look pretty white to me all the way up to 1000 millamps, after that they look a little more yellowish maybe

Brained by Reef · 04/19/2011, 08:15 PM

I signed in to Reef Central tonight specifically wanting an answer to that question. I know I am being redundant but I want to know:

Say you have a particular LED, BIN number, etc.
And the specs say the LED is 8,000 to 10,000 K temperature... or 4,000 to 6,000 K.

Does the Kelvin go up or down with changes in amperage?????
I would greatly appreciate any help with this inquiry.

Brained by Reef · 04/20/2011, 04:28 PM

Yo

Been told this:

"Color temperature has nothing to do with amperage, the LED will put out the same color temp regardless of how hard you're running the LEDs."

"They aren't able to produce LEDs with an exact temperature, so there's always a range. Typically it doesn't vary too much and we end up with something in the 6-7k range, but LEDs are "grown" so they can't make them with exact Kelvin temperatures."

04/18/2011, 09:35 PM	#1
125mph Registered Member Join Date: Apr 2011 Location: San Diego, CA Posts: 1,405	Cree XP-G color Hi guys, A quick question.. I know the LED color spectrum changes based on how you dim the lights. The Cree XP-G (R2) cool whites are rated at 5000K. (http://ledsupply.com/creexpg-w354.php). If you run this LED at the rated 1000mA, will the color be 5000K? I doc sheet is confusing (http://ledsupply.com/docs/XLampXP-G-1.pdf) but it appears if the LED is run at 350mA produces 5000K? Assuming they run at 5000K color, what happens to the color if you dim them.. Does the color get lower like 3000K? __________________ 180G Rimless Starphire 72x24x24 (Miracles) 3 x Ecotech XR15w G4 Pro \| T5 x 4 \| 2 x Mp40wQD GEO 612 Cal Reactor \| Vertex Omega 150 Skimmer \| Chaeto Reactor Synergy Reef CL44 Sump \| Neptune Apex

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04/19/2011, 04:33 AM	#2
nanojg Registered Member Join Date: Jan 2009 Location: Lubbock, Texas Posts: 2,174	They look pretty white to me all the way up to 1000 millamps, after that they look a little more yellowish maybe

04/19/2011, 08:15 PM	#3
Brained by Reef Registered Member Join Date: Dec 2010 Posts: 7	I signed in to Reef Central tonight specifically wanting an answer to that question. I know I am being redundant but I want to know: Say you have a particular LED, BIN number, etc. And the specs say the LED is 8,000 to 10,000 K temperature... or 4,000 to 6,000 K. Does the Kelvin go up or down with changes in amperage????? I would greatly appreciate any help with this inquiry.

04/20/2011, 04:28 PM	#4
Brained by Reef Registered Member Join Date: Dec 2010 Posts: 7	Yo Been told this: "Color temperature has nothing to do with amperage, the LED will put out the same color temp regardless of how hard you're running the LEDs." "They aren't able to produce LEDs with an exact temperature, so there's always a range. Typically it doesn't vary too much and we end up with something in the 6-7k range, but LEDs are "grown" so they can't make them with exact Kelvin temperatures."