Coin validation can be advantageously improved by transforming measured data values associated with coin characteristics from a first geometric space to a second geometric space, in which the transformed values in the second geometric space are preferably better adapted for discrimination between different coin denominations than the corresponding values in the first geometric space. A data intake and query system as described herein generally refers to a system for collecting, retrieving, and analyzing data. The thus formed EL element can be applied to an EL light device with a lamp base, a night light with bend-n-shape properties, andor outdoor lighting at a most reasonable cost and utilizing any desired power source such as a wall outlet, battery, solar, or any other energy sources for people to use anywhere with lowest power consumption and incredible light effects. The first phosphor emits light with a first spectral characteristic when irradiated by the light at the wavelength and the second phosphor emits light with a second spectral characteristic when irradiated by the light at the wavelength. Each consecutive second time interval is formed from two or more consecutive first time intervals. The active disc and the dummy disc are bonded to form a single body, and the dummy disc is made of methylmethacrylate-acrylonitrile-butadiene-styrene copolymer resin.