H - Electricity – 05 – B
Patent
H - Electricity
05
B
315/43, 315/66
H05B 37/02 (2006.01) H05B 41/392 (2006.01)
Patent
CA 1233505
17 ABSTRACT: High-pressure-sodium HID lamps characteristic- ally display an increasing operating voltage throughout life. The industry has established operating standards as a trapezoidal figure on a graph wherein lamp wattage is plotted on the axis of ordinates and lamp voltage is plotted on the axis of abscissae. The parallel trapezoid sides represent minimum permissible and maximum permissible operating lamp wattages and the remaining sides of the trapezoidal figure are two lines of sharply rising positive slope which represent minimum permissible and maximum permissible lamp voltages. The lamp-life operating characteristics are describable by a curve which enters into the trapezoid through the line representing minimum lamp voltages and which exits from the trapezoid through the line representing maximum lamp voltages. The invention describes a device provided with means which to minimize lamp voltage variations throughout normally anti- cipated life, operate the lamp for an initially relatively short period of time until the operating voltage is a predetermined value and the wattage consumption is relatively high as compared to the minimum value. There- after, the means continue to operate the lamp so that the operating characteristic curve of lamp wattage consumption versus increasing lamp operating voltage displays a slope which is negative in nature and which does not exceed an operating wattage drop of about 1.5 percent per one volt increase in lamp operating voltage. Thereafter, the means continue to operate the lamp in such manner that the characteristic operating curve ultimately exits from the trapezoidal figure proximate the lower right-hand portion thereof.
435903
Bhalla Ranbir S.
Elms Robert T.
Tallet Jose E.
Bhalla Ranbir S.
Elms Robert T.
Tallet Jose E.
Van Steinburg C.e.
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