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The purpose of this paper is to extract the luminance, electric power consumption, power saving ratio, cooling load, and cooling load-saving ratio in the comfort condition of workers.The established illuminances for this paper are 300, 500, 750, 1000lx and the settings of a task-plane are no-partition, partition-reflectance 20%, 38%, 73%.Though the value of electric power consumption is increased with the established partition, the electric power consumption is decreased with the increasing partition-reflectance in the established partition.Comparing to the general lighting system, the ratio of electric power reduction by the Task and Ambient Lighting system is 34.1~80.8% under the condition of non-partition and partition. The reduction effect of electric power is maximized under the condition of 750 and 1000lx of the established illuminance.The cooling load is reduced with the increasing TAL ratio and partition-reflectance, and the cooling load saving ratio by the Task and Ambient Lighting system is 26.5~5.6% compared to the General Lighting.The luminance-difference between the work-sheet and the task-plane is increased with the increasing illuminance, and the minimum luminances for the comfortness are 15cd/㎡, 10cd/㎡ and 13cd/㎡ on the wall, the floor, and the ceiling, respectively.