With a camera in the fridge...
"You'll be able to check that the light actually does go off."
No, you won't! It's a con!
The light will have to come on whenever you access the image from the camera - at least, that's what they'll tell you - so you still won't truly know if the light goes out, and instead have to continue taking it on faith*.
* All hail the holy instruction manual, for it doth decree that the light comes on for thee. Or something.