A device (100) has surfaces (21, 22, 23, 24) and an anti-biofouling system (10) comprising at least one light source (11, 12) for performing an anti-biofouling action on at least a majority of the surfaces (21, 22, 23, 24), the at least one light source (11, 12) being adapted to emit rays of anti-biofouling light. The surfaces (21, 22, 23, 24) are configured relative to each other and to the at least one light source (11, 12) such that during operation of the at least one light source (11, 12), at least a majority of the surfaces (21, 22, 23, 24) is free from shadow with respect to the rays of anti-biofouling light from the at least one light source (11, 12), wherein it may be possible for the rays of anti-biofouling light to reach the surfaces (21, 22, 23, 24) by skimming along the surfaces (21, 22, 23, 24).一種裝置(100)具有表面(21、22、23、24)及一抗生物附著系統(10)，該抗生物附著系統(10)包含用以對至少大部分該等表面(21、22、23、24)執行一抗生物附著動作之至少一光源(11、12)，該至少一光源(11、12)經調適以發射抗生物附著光線。該等表面(21、22、23、24)係相對於彼此且相對於該至少一光源(11、12)而組態，使得在該至少一光源(11、12)之操作期間，至少大部分該等表面(21、22、23、24)不處於相對於來自該至少一光源(11、12)之該等抗生物附著光線之陰影中，其中該等抗生物附著光線可藉由沿著該等表面(21、22、23、24)掠過而到達該等表面(21、22、23、24)。
