Lucy Zodion PECU Photo Cell Units

Royce Thompson - Photocells (PECU's)

Lucy Zodion- Photocells (PECU's)

Royce Thompson photocells for street lighting applications include one part, two part and miniature photo electronic control units. Photocells (PECUs) are light operated switches. 

Royce Thompson photocells switch the street lighting supply ON to a load when the light level falls beneath a given value (Dusk) and switch the supply OFF when it rises above another level (Dawn). The ratio between the two light levels is known as the switching ratio.

Lucy Zodion PECU Photo Cell Units