From Ian Benton
I have worked for the past 20 years in the “professional audio and lighting” industry, designing moving, flashing, sequencing, colour-changing and stroboscopic lighting for use in discotheques and night clubs. In that time, neither my colleagues nor I have discovered any lighting effect which has anywhere near as much ability to incapacitate as has the alcohol served in such establishments (10 May, p 38). The only people inconvenienced by two decades of endeavour are the poor photosensitive epileptics.
Ashton-in-Makerfield, Lancashire, UK
