<P> The Guinness Book of Records says the world's largest glow stick was cracked at 9 ft 10 in (3 m) tall . It was created using Plexiglass by KNIXS GmbH (all Germany) in Darmstadt Weiterstadt, Germany, on 29 June 2009 . </P> <P> Glow sticks emit light when two chemicals are mixed . The sticks consist of a tiny, brittle container within a flexible outside container . Each container holds a different solution . When the outer container is flexed, the inner container breaks, allowing the solutions to combine, causing the necessary chemical reaction . After breaking, the tube is shaken to thoroughly mix the two components . </P> <P> The glow stick contains two chemicals and a suitable dye (sensitizer, or fluorophor). This creates an exothermic reaction . The chemicals inside the plastic tube are a mixture of the dye and diphenyl oxalate . The chemical in the glass vial is hydrogen peroxide . By mixing the peroxide with the phenyl oxalate ester, a chemical reaction takes place, yielding two moles of phenol and one mole of peroxyacid ester (1, 2 - dioxetanedione). The peroxyacid decomposes spontaneously to carbon dioxide, releasing energy that excites the dye, which then relaxes by releasing a photon . The wavelength of the photon--the color of the emitted light--depends on the structure of the dye . The reaction releases energy mostly as light, with very little heat . The reason for this is that the reverse 2 + 2 photocycloaddition of 1, 2 - dioxetanedione is a forbidden transition (it violates Woodward--Hoffmann rules) and cannot proceed through a regular thermal mechanism . </P> <P> By adjusting the concentrations of the two chemicals, manufacturers can produce glow sticks that either glow brightly for a short amount of time or more dimly for an extended length of time . This also allows design of glow sticks that perform satisfactorily in hot or cold climates, by compensating for the temperature dependence of reaction . At maximum concentration (typically only found in laboratory settings), mixing the chemicals results in a furious reaction, producing large amounts of light for only a few seconds . Heating a glow stick also causes the reaction to proceed faster and the glow stick to glow more brightly for a brief period . Cooling a glow stick slows the reaction a small amount and causes it to last longer, but the light is dimmer . This can be demonstrated by refrigerating or freezing an active glow stick; when it warms up again, it will resume glowing . The dyes used in glow sticks usually exhibit fluorescence when exposed to ultraviolet radiation--even a spent glow stick may therefore shine under a black light . </P>

Where does the light energy of a glowing light wand come from
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