Optischer Schlüssel (IR)

Before setting off for (hopefully) sunnier climes, many prospective holidaymakers use a UV lamp to acquire an initial tan. Unfortunately, things can ·go rather amiss, and instead of a nice golden brown, the careless or forgetful user can end up the colour of one of Her Majesty`s pillar boxes! The following circuit was designed to prevent any of our readers from suffering just such a painful experience.