(the above video is of the original ikea billboard - Case study by7 Janniki)

For an un-named client pitch I successfully created a CMYK version of the ikea billboard not with light, nor on a billboard. However, I was using laminate gels pasted on glasses to view the design through various color spectrums. Yellow was the most difficult, but came to the conclusion that the official billboard design actually used black light to make the yellow text pop and therefore a special ink that responded with a bright glow.