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Photoelectric Smoke Detectors Light Scattering Type 1 These detectors use a Light-Emitting Diode (LED) that sends a beam of light into a dark chamber. A photo diode sits on the other side of a partition within the chamber. 1 Smoke particles entering the chamber deflect some of the light rays into the photocell. The photo cell generates a current when exposed to light, and if the current reaches a certain level, the smoke detector alarms.