A digitally controlled light source for a, well, shall we say, special application.
The light source was about 24 x 16 inches with LED's packed as tight as you can imagine. For best thermal transfer and uniformity the assemblies were bonded to a 0.5 inch thick aluminum base-plate in a vacuum fixture.
To answer the other question, power was provided by a set of 48V 500W AC to DC power supplies feeding purpose-built current and voltage control boards.
It produced an output luminance of about 60,000 cd/m2 (sixty thousand candelas per square meter). In other words, it was actually dangerous to look at it directly, all measurements had to be taken through stacks of attenuating filters. Fun project but about as dangerous as working with lasers.
The light source was about 24 x 16 inches with LED's packed as tight as you can imagine. For best thermal transfer and uniformity the assemblies were bonded to a 0.5 inch thick aluminum base-plate in a vacuum fixture.
To answer the other question, power was provided by a set of 48V 500W AC to DC power supplies feeding purpose-built current and voltage control boards.
It produced an output luminance of about 60,000 cd/m2 (sixty thousand candelas per square meter). In other words, it was actually dangerous to look at it directly, all measurements had to be taken through stacks of attenuating filters. Fun project but about as dangerous as working with lasers.