In general lighting calculations, the fraction of initial lamp lumens that reach the work plane is the Co-efficient. The Co-efficiant is a function of luminaire efficiency, room surface reflectances, and room shape.
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Filaments are designated by a letter combination in which C is a coiled wire filament, CC is a coiled wire that is itself wound into a larger coil, and SR is a straight ribbon filament. Numbers represent the type of filament-support arrangement.