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Our study evaluated the lighting environments in offices, including the trade-offs between various attributes. Conjoint analysis, common in the field of market research, was used to evaluate these trade-offs. The attributes were illuminance, light distribution, glare, design, cost, usage of natural lighting, and recycling (229 subjects participated). Consequently, the concept of office-lighting preferences can be understood quantitatively. That is, part-worth utilities and attribute importance for all subjects showed the general characteristics of office-lighting preferences. Moreover, comparing groups of subjects according to attribute importance or the subjects' characteristics suggested valuable methods for understanding office-lighting preferences in depth.