Question about Xiaomi Yeelight Lightstrip Plus

If I understand you correctly, you mean the triangular diffuser. Yes, this light strip is compatible with it. But note that there is no adhesive strip on the profile diffuser and you need 2 (diffuser is 1m, LED strip 2m). If you want to mount the diffuser on the ceiling, you need a strong adhesive tape. Otherwise it can happen, it happened to me :(, that the 2 diffusers crash down and cut your LED strip cleanly in half.... not quite as cool :/