Is your campus/school/neighborhood really "green"? Here's a two-sided viewer for studying local area lighting for light and energy efficiencies, and light pollution. Useful for physics, astronomy and environmental science courses, teachers or informal educators. This product is for viewers not prepackaged in classroom sets. The front side shows spectra of High Pressure and Low Pressure Sodium, Metal Halide, Mercury Vapor, Fluorescent and CFL, and Incandescent lights, plus specialized lights such as LEDs, Neon and "Black Light". The obverse side has notes about the different lights, a table of representative energy, light and other characteristic values, instructions on surveying one's neighborhood, and a general description about continuous, absorption and emission spectra! Extra-large viewing window, 3 inches (7.5 cm), makes it easier for one or more students to see the spectrum. The comparison spectra were made using the same diffraction grating film, sharing the same scale, resolution and light distribution as the viewed spectrum when directions (included on both sides of the Viewer) are followed. Measuring scales are approximately proportioned to sine-theta instead of linear like most hand spectroscopes, accommodating for the Law of Diffraction and removing common systematic errors. Brightest visible line markers help eliminate false identifications. Specifications: 5.75 x 8.5 inches (~14.5 x 21.5 cm). Comes with instructions/notes sheet.

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