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Difference between revisions of "Cree"
Cree light bulb uses XT-E
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[[File:Ansiwhite.jpg|thumb|Chromaticity chart with tint bins used by Cree]]Cree is a [[LED]] manufacturing company based in Durham, North Carolina. They produce a number of different models of high output LED's that are widely used in flashlights. They do not actually make flashlights, though some companies will describe their product as a "Cree flashlight." This refers to the LED inside the flashlight. | [[File:Ansiwhite.jpg|thumb|Chromaticity chart with tint bins used by Cree]]Cree is a [[LED]] manufacturing company based in Durham, North Carolina. They produce a number of different models of high output LED's that are widely used in flashlights. They do not actually make flashlights, though some companies will describe their product as a "Cree flashlight." This refers to the LED inside the flashlight. | ||
Cree bins individual models of LED on the basis of total flux or light output, typically measured at 350mA. Bin numbers might be P4, Q2, Q3, Q4, Q5, R2, R3, R4, and R5 with each bin being about 5% additional flux. The P4 is 80 lumens, a Q5 would be 107 lumens, and the R5 bins are 137 lumens. At higher amperage than 350mA, the brightness goes way up, with the XP-G producing 3 times as many lumens at a maximum current of 1500mA. | Cree bins individual models of LED on the basis of total flux or light output, typically measured at 350mA. Bin numbers might be P4, Q2, Q3, Q4, Q5, R2, R3, R4, and R5 with each bin being about 5% additional flux. The P4 is 80 lumens, a Q5 would be 107 lumens, and the R5 bins are 137 lumens. At higher amperage than 350mA, the brightness goes way up, with the XP-G producing 3 times as many lumens at a maximum current of 1500mA. | ||
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==XT-E== | ==XT-E== | ||
[[File:Cree-xte.jpg|thumb|Cree XT-E LED]]Introduced in February 2012, the XT-E has the same size chip as the XP series but seems to have a wider viewing angle for more flood and less throw. Can be driven up to 1.5A and available in bins up to R5 (at 350mA). This LED is binned at an operating temperature of 85° C instead of 25°, so in order to directly compare its output to other LED's that are typically binned at 25 degrees, the numbers in the table below have been increased by 14% (see [[XT-E output]] for the 85° numbers). Cree introduced the XT-E as a low-cost, high efficiency LED capable of 148 lumens per watt at 350mA, offering higher lumens per dollar. The LED is not a flat square, but has an X shaped hill on the surface. The beam is like a small XM-L with a large hotspot and some varying tint across the beam. [[EagleTac]] announced that the XT-E would be an option in its D25 clicky series in April 2012, but XT-E lights were never actually released, supposedly due to beam quality issues. At about the same time, KaiDomain offered P60 drop-ins and flashlights with the XT-E. [http://www.cree.com/products/pdf/XLampXT-E.pdf Datasheet], [http://www.cree.com/news-and-events/cree-news/press-releases/2012/february/120207-xte press release]. | [[File:Cree-xte.jpg|thumb|Cree XT-E LED]]Introduced in February 2012, the XT-E has the same size chip as the XP series but seems to have a wider viewing angle for more flood and less throw. Can be driven up to 1.5A and available in bins up to R5 (at 350mA). This LED is binned at an operating temperature of 85° C instead of 25°, so in order to directly compare its output to other LED's that are typically binned at 25 degrees, the numbers in the table below have been increased by 14% (see [[XT-E output]] for the 85° numbers). Cree introduced the XT-E as a low-cost, high efficiency LED capable of 148 lumens per watt at 350mA, offering higher lumens per dollar. The LED is not a flat square, but has an X shaped hill on the surface. The beam is like a small XM-L with a large hotspot and some varying tint across the beam. [[EagleTac]] announced that the XT-E would be an option in its D25 clicky series in April 2012, but XT-E lights were never actually released, supposedly due to beam quality issues. At about the same time, KaiDomain offered P60 drop-ins and flashlights with the XT-E. Cree uses the XT-E LED in its line of household light bulbs, introduced in 2013. [http://www.cree.com/products/pdf/XLampXT-E.pdf Datasheet], [http://www.cree.com/news-and-events/cree-news/press-releases/2012/february/120207-xte press release]. | ||
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