For their music video for the song Bright Siren, Japanese band androp created a mind-blowing giant display using Canon 60D DSLRs and strobes as the individual pixels. They used 250 separate cameras and flash units, and controlled each one individually using a computer program. Every single light used was real, and no computer-generated trickery was used. You can also check out the behind-the-scenes video they made.
I think they went just a tad too much on the lighting equipment, don't ya think?