Photocells
Charles Endirect
Fisher Pierce
Haromarkt/Incatron North
Horstmann
Hy-Lite Controls
Longjoin
Royce Thompson Electrical
SELC / Westire
Sirebeck
Lucy Zodion (Fisher Karpark/Cableform)
Unknowns
Specials
AcRo
35 Lux Mk 2 photocell, from February 2013.
Mk 2.1 photocell, from November 2014. This photocell is also rated at 35 Lux. The video below demonstrates the self-test facility incorporated into the circuitry of these units: