Lumileds Luxeon very high brightness LED modules
Russell McMahon email (remove spam text)
Luxeon LED illuminator site.
Very well done.
Copious technical information both on module characteristics and design,
lifetime, operation ...
For those who haven't met them, the Luxeon units offer outputs comparable
with typical incandescent bulbs but with many advantages (high lifetime,
good colour matching, high efficiency, bright well controlled beam pattern,
...). Applications include standard lighting (torches, car lights, ...) and
specialist applications such as dental resin curing.
Available in white plus arrange of colours and a number of output patterns
and power levels.
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See also: massmind.org/techref/displays.htm?key=led