jtr1962
Flashaholic
Press release
[ QUOTE ]
Cree, Inc. (Nasdaq: CREE) today introduced two new versions of its light emitting diode (LED) product family. The new green versions include the XT-290™ LED and the XB-900™ LED. The XT-290, offered in a 527nm version, has a typical radiant flux of 9mW at 20mA. It is also the thinnest, brightest, and with a typical forward voltage of 3.2V, consumes the least power of any Cree standard size green LED chip. The XB-900 527nm version has a typical radiant flux of 30mW at 350mA, and the XB-900 505nm version has a typical radiant flux of 45mW at 350mA.
[/ QUOTE ]
Based on the typical forward voltage drop of 3.2V, and the luminous efficacy of 527nm radiation, these LEDs should have efficiencies in the range of 65 to 70 lm/W for the 5mm version. The high-power versions will be somewhat less efficient.
[ QUOTE ]
Cree, Inc. (Nasdaq: CREE) today introduced two new versions of its light emitting diode (LED) product family. The new green versions include the XT-290™ LED and the XB-900™ LED. The XT-290, offered in a 527nm version, has a typical radiant flux of 9mW at 20mA. It is also the thinnest, brightest, and with a typical forward voltage of 3.2V, consumes the least power of any Cree standard size green LED chip. The XB-900 527nm version has a typical radiant flux of 30mW at 350mA, and the XB-900 505nm version has a typical radiant flux of 45mW at 350mA.
[/ QUOTE ]
Based on the typical forward voltage drop of 3.2V, and the luminous efficacy of 527nm radiation, these LEDs should have efficiencies in the range of 65 to 70 lm/W for the 5mm version. The high-power versions will be somewhat less efficient.
