Sure, Hypnotic Sample operates in darkness. Although there won't be any stringent procedures about this, the spell’s materials entail a “glowing stick of incense” and “phosphorescent substance,” indicating that the twisting sample of colors generates a light exhibit effect that features even in darkness. en: Conjuros, Conjuros de nivel 3, https://www.youtube.com/shorts/2bqrDoavYZM