1. Other causes of migraine are VDU screens and strip-lighting.

2. It was a long windowless studio with neon strip-lighting set into the ceiling.

3. In some experiments the filter was not used and the illumination from the striplight then made a contribution.

4. The illumination source was either a single tungsten lamp or this plus a conventional warm white striplight as appropriate.

5. We the doctors move between ceiling and floor, between striplight and the croak of linoleum.