question: What are some factors to consider in calculating operating costs of lighting ?
answer: illumination requirements , cost of the lamp and labor cost to replace lamps ( taking into account effective lamp lifetime ) , cost of electricity used
turker_answer: Some factors to consider when calculating operating costs of lighting are illumination requirements , cost of the lamp and labor cost to replace lamps ( taking into account effective lamp lifetime ) , cost of electricity used .
rule-based: Some factors to consider in calculating operating costs of lighting are illumination requirements , cost of the lamp and labor cost to replace lamps ( taking into account effective lamp lifetime ) , cost of electricity used .