Blean (n.) Scientific measure of luminosity : 1 glimmer = 100,000 bleans. Usherettes' torches are designed to produce between 2.5 and 4 bleans, enabling them t

Blean (n.) Scientific measure of luminosity : 1 glimmer = 100,000 bleans. Usherettes' torches are designed to produce between 2.5 and 4 bleans, enabling them to assist you in falling downstairs, treading on people or putting your hand into a Neapolitan tub when reaching for change. ~ Douglas Adams and John Lloyd