Yet another LED question

[perfectbite]

What makes a super bright LED different from a normal brightness LED? Thanks.

[Chris Smith]

Color for starters.<p>A blue led has ten times the usable visible light of a red LED, simply because the human Eye response is greater to blue than to the color Red<p> Larger dies within the led that consume more power, and techniques for exciting the material much like a laser diode, accounts for the brighter LEDS of the same color. <p>Like the FET revolutionized the transistor, so does construction design of the die material, and doping, ..... for the led. <p>And there is even Fluorescence hapening inside some LEDs.