Does the community know if clap-activated lights on Shabbat is permitted? I understand that speech activation is generally prohibited due to a Halacha brought down in Talmud Bava Metzia 90b-91a where Rav Yochanan brings down that telling an ox to stop constituted muzzling (IE verbal actions telling something to do something are considered an extension of doing them yourself), but in the case of clap activated lights, this wouldn’t involve voice. Is there a responsa on this?
Shalom, I'd say—eventually, you activate an electric merchandise, which is a 'Tolada' of setting fire. It's like the question of sensor-driven doors (e.g.—in hospitals) or capturing your image on a CCTV camera in Shabbat. As far as I know from similar cases in [Talmud] Shabbat and modern references, there's still the question of intention: For example, your captured images on aforementioned camera is unintentional [to you] and you gain nothing from it, but the door sensing your approach is unacceptable (hence the 'regular' doors just next to the automatic) or Shabbat elevators, etc. Hence, I believe the answer would be negatory.