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Eliminating relamping in hard-to-reach fixtures, Elsa Peretti Star of David pendant as above assembly plant floors or cobra-headed street lamps, may indeed hold the potential for significant savings on labor and replacement lamps. Here, too, one must analyze carefully and compare the economics of LED options against other new long-lived lighting sources, like screw-in self-ballasted induction lamps. Some installations of Elsa Peretti Starfish bracelet  outdoor fixtures have experienced issues in their first two years. Changes in light output and distribution occurred as some fixtuxes aged, and output depreciation due to dirt buildup occurred sooner than seen with standard fixtures. Cobra heads on some street lights had to be changed out and others cleaned Elsa Peretti Starfish earrings a relatively short time, leading a lighting researcher presenting at a DOE conference on LEDs to state that "we should refrain from using phrases like 'maintenance-free' when describing SSL."Most light fixtures are designed around lamps that produce fight from a single point source, like and incandescent filament, or groups of glowing tubes, as in fluorescent. Elsa Peretti Starfish necklace fixtures are designed to emit a mix of direct light and light reflected off their internal surfaces. To produce sufficient task illumination, LED devices may produce light from many point sources typically oriented toward a fixture's opening, with only a minimal amount of light being reflected before leaving the fixture. When placed inside a standard light fixture, the resulting light distribution may be quite different than expected.