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In this study, our focus was on exploring the changing illuminance of work surfaces in different ambient uniformity spaces in the office, with a specific emphasis on sustainability and energy-saving considerations. To investigate this, we conducted a comprehensive study in a laboratory setting that replicated an office environment. The study involved the participation of 20 adults as subjects. The findings of our study revealed a strong correlation between the uniformity of ambient lighting illuminance within the indoor space and the illuminance levels observed specifically at the task plane. Notably, when the surrounding illuminance exhibited uniformity, we observed a significant reduction in the E_H as adjusted by participants during VDT operation. Interestingly, the task illuminance adjusted by the subjects was lower than the usual standard. However, we did not find any significant correlation between the uniformity of indoor ambient lighting illuminance and the appropriate VDT screen luminance. In situations where energy-saving measures are required, it is crucial to maintain an even luminance in the surrounding space to ensure that the minimum lighting level in the office is upheld. Future discussions should delve into task-ambient lighting models, exploring beyond task illuminance standards alone.