Cree: Difference between revisions

Very compact LED (the die is mounted on a chip 2.45 mm square opposed to 3.45 mm square for XP series) introduced in February 2012, promising lower cost. Should provide similar brightness to XP-E LED's. First available units were warm white with Q2 brightness bin (at 350mA). Like the XT-E, the LED's are binned by lumen output at a temperature of 85 degrees C instead of 25 degrees like earlier LED's. Since the datasheets indicate 14% higher output at 25 degrees, the output numbers from Cree have been increased in the table below for 25 degrees (also see [[XB-D output]]) to make it easier to compare LED's. Can be driven up to 1000mA. [http://www.cree.com/products/pdf/XLampXB-D.pdf Datasheet], [http://www.cree.com/news-and-events/cree-news/press-releases/2012/january/120111-xbd press release].

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). The LED is binned at an operating temperature of 85 degrees instead of 25 degrees Celsius, 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% (or see [[XT-E output]]. 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]] was the first company to feature the XT-E in a production light, making it an option in the D25 clicky series in April 2012. 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].