Sacred space has always been a significant place to enhance human spirituality, essential to contemporary human suffering from secular pressure. This study aims to investigate the effects of filtered natural lighting for meditation in sacred space. This study used the methods focusing on the designed experiments including the measurement of the illuminance, open-ended questionnaire, closed-ended questionnaire and extended semi-structured interviews from 61 participants. The experimental results

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... of T-test had significantly difference and interviews indicated the common feelings and some special perceptions. We concluded in the following: First, the filter of the natural lighting would affect the meditation. The meditation space should be dim light to most participants. Second, the intensity of light could be approved to affect the meditation. The degree of effects could be explored further. However, it should not be too strong and too dark. Third, the rate of inflation of illuminance would affect the meditation. Finally, we have to consider the adaptation of different groups, and the control of the direct light that relates to the feeling of "nature", "power" and "energy". This study would significantly contribute appropriate ideas to the meditation space in interior design.