Lighting theory ultraviolet radiation

High light intensity may have decreased the concentration of secondary metabolites if the plants were stressed by the high irradiance (see the environmental stress theory, Section IV.D). The plants grown at 100% of surface irradiance probably received high doses of ultraviolet radiation as well as photosynthetically active radiation. Ultraviolet radiation can stress Dictyota ciliolata, leading to decreased concentrations of secondary metabolites.183... 

Planck was the German theoretician whom Leo Szilard would meet at the University of Berlin in 1921 bom in 1858, Planck had taught at Berlin since 1889. In 1900 he had proposed a revolutionary idea to explain a persistent problem in mechanical physics, the so-called ultraviolet catastrophe. According to classical theory there should be an infinite amount of light (energy, radiation) inside a heated cavity such as a kiln. That was because classical theory, with its continuity of process, predicted that the particles in the heated walls of the cavity which vibrated to produce the light would vibrate to an infinite range of frequencies. 

The classical theory of electromagnetic radiation, attributed primarily to James Clerk Maxwell, describes radio waves, microwaves, infrared and visible and ultraviolet light, x-rays, and y-rays all as combinations of oscillating... 

The theory underlying electronic spectroscopy with lasers is essentially the theory of visible or ultraviolet photon interactions. The distinctive features that arise with the deployment of laser light in electronic spectroscopy are principally those that relate to or exploit the qualities of the electric field produced by the laser beam. Laser electronic spectroscopy is primarily based on coupling (usually of dipolar character) between the electron clouds of individual ions, atoms, chromophores or molecules of the sample with the electric field of the impinging laser radiation. The high level of monochromaticity affords the means to obtain high-resolution data. 

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