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Fluorescent Lamps

November 4th, 2011

Development of high-intensity fluorescent lamps serious drawback of standard fluorescent tubular shape are their large size (especially length) at low power and, consequently, low brightness. Because it requires a large amount of material for the production of lamps and fixtures and virtually impossible to create high levels of illumination required for accurate visual works. So long (from 50s) made attempts to increase the brightness of the fluorescent lamp while maintaining high light output and durability. Obviously, the increase in brightness is inevitably associated with an increase in w = k 1EI/nd. Ways of increasing the light output at higher values of w. A simple increase in the power of the standard types of lamps above a certain limit by increasing the current strength leads to a significant drop in light output. When you overload a 40-watt lamp to 200 watts, the temperature rises to 90-95 C and luminous efficiency drops to 34%.

When the artificial maintenance of the mercury vapor pressure at an optimum level (GAD = 44, L-50 ) for the same increase in light output power drops to 45-48%. Therefore, the task of creating fluorescent lamps with high light output at higher values of w was primarily to find the conditions for discharge, providing for increased power densities higher yield of resonance radiation than conventional bulbs. Experimental and theoretical studies in this regard, both abroad and in our country, led to a deeper understanding of physical processes in the tubes and the creation of the theory of the discharge. As a result, there have been ways to a partial solution to this problem and the development of fluorescent lamps with higher light output at higher values of w. Based on analysis of the theoretical relations, it was shown that the necessary conditions of discharge reduced to maintain the optimum mercury vapor pressure corresponding to the maximum output of the resonant radiation, regardless of the specific power to raise the electron temperature, to reduce the concentration electrons to reduce the number of quenching collisions and to reduce heat loss.

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