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The purpose ofthis study is to cEarify effects oflighting and the existence ofa stranger on conversat 産 onal sound ｝ evels ． The 且rst experiment was to let subjects estimate the sound levd fセ om photo stimuli and then the second was to measure conversationa 】sound levels in the labora ‡ ory where experimental variables ； three lighting conditionsand the existence ofa ． stranger were implemented， It was shown that the conversational sound level was higher in the highly illuminated areas （ e ． g ． general lighting ） mQre than in the areas wherc there was low

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