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XLamp a19 RefeRence Design

trademarks of Cree, Inc. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales at sales@cree.com.

Figure 5: LED configurations for a 60-W-equivalent, non-directional LED lamp

Running at these space-constrained and elevated temperatures, it takes eight XP-E HEW LEDs from the R2 flux bin,

driven at 350 mA to deliver 810 lumens, at 12 watts of power with an efficacy of almost 68 lm/W. The single CXA2011

from the J flux bin, running at 250 mA delivers improved performance: 814 lumens, 11.3 watts and over 72 lm/W.

impLementAtiOns And AnALysis

The most thorough analysis of a cree leD a19 bulb comes from a collaboration with marvell Semiconductor (www.

marvell.com). The 40-watt-equivalent leD replacement lamp uses four cree Xp-e Hew leDs and marvell’s 88em8081

in good correspondence with the pcT analysis in Figure 3.

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Details on this design are available at www.marvell.com/green-technology/Marvell_Cree_A19LED_Reference_Bulb_platform_

brief_PB001.pdf