Comparative tests of carbon, metallized carbon and tantalum filament lamps . H .01 .03 .05 .07 .09 .11 .13 .15 .17 .19 .21 .23 .25 Fig. 31 Cost of P^nergy Pek K. W. Hour lamps upon pooily regulated alternating current circuit withsome vibration, that is, condition B. Considering the curve for the carbon lamp working undercondition A it is seen that for very low prices per kilowatt-hourfor power, this lamp is the most economical on account of thesmall number of burn-outs and the low cost of the lamps. Forcosts of power from $.011 to $.022 per kilowatt-hour the metal-lized lamp gives the lowest
Comparative tests of carbon, metallized carbon and tantalum filament lamps . H .01 .03 .05 .07 .09 .11 .13 .15 .17 .19 .21 .23 .25 Fig. 31 Cost of P^nergy Pek K. W. Hour lamps upon pooily regulated alternating current circuit withsome vibration, that is, condition B. Considering the curve for the carbon lamp working undercondition A it is seen that for very low prices per kilowatt-hourfor power, this lamp is the most economical on account of thesmall number of burn-outs and the low cost of the lamps. Forcosts of power from $.011 to $.022 per kilowatt-hour the metal-lized lamp gives the lowest cost, while for all the higher prices ofenergy the tantalum gives the best economy. For condition Bthe relative performance does not change a great deal, thoughon account of the large number of burn-outs with the metallizedlamp at no time does it give the most economical results. These results seem to show that so far as economy of oper- 38 ILLINOIS ENGINEERING EXPERIMENT STATION /carbon. Fig. 32 Cost of Energy Per K. W. Hour ation goes, the metallized lamp has practically no field in incan-descent lighting. From the standpoint of low cost of renewals,an important item with lighting companies that furnish free re-newals, it cannot compete with the carbon or tantalum lamp,especially upon poorly regulated circuits and where there is vi-bration or rough usage. In cost of power consumption the car-bon lamp leads for very low costs of power, and the tantalum forhigher costs of energy. The metallized lamp seems to have anarrow field upon very well regulated circuits where the costis between $.02 and $.03 per kilowatt-hour. Summary As a summary it might be well to consider separately thethree lamps and compare them with respect to the following AMKINE—COMPARATIVE TESTS OF LAMPS 39 eight considerations which determine the choice of an incandes-cent lamp. 1. Efficiency. 2. Cost of Operation. 3. Maintenance ofCandle Power and Efficiency. 4. Life. 5. Quality of Light. 6. Distri
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