LDR

 
7mm size,
with two section of sensitive surface (one common terminal)
may be used to differentiate 2 section of lighting strength.

 
 LDR-12GL

12mm diameter,
Metal Casing with glass protective surface.

LDR-12PLa

12mm diameter,
with plastic casing
with glass protected surface,
with two big terminals.

Diameter : 12mm
in transparent clear plastic case