Different from normal LEDs, or different from normal Luxeon Star LEDs?
If you mean different from normal Luxeon Stars, these have optics on them to collimate the light into a narrow beam path. These are known as Star/O's.
Due to their high output, the Luxeon Star LEDs are measured in Lumens, rather than mcd. Although some have done the conversion and they come up with around 75,000-180,000 mcd, when compared to a normal 5mm ultra-high power led at around 11,000mcd max, they're pretty bright. These are rated 100,000 hours at 1 Watt, they make a 5 watt version which is rated for 5<edit, that should read 500
> hours, and blindingly bright.
They draw MAX 350ma a piece at 2.8-3.5 volts. The 5 watt versions run up around 8 volts. At full power it is required that they be mounted to a heat sink.
The 1 watters cost about $14 each in small quantity, the 5 watters are closer to $40 each.