Here is an Intermatic standard grade LED compatible electronic photocontrol with a non-drift silicon eye,instant on at 1.5 fc, 2-5 second delay off at 2.25 fc.
I see this is one of the units manufactured by LongJoin. Or at least, I think they are. I have one of these but it's a different design. It's the same design as their new Night Fox photo control line. If you haven't checked them out yet they're pretty cool. EYE also has a line of photocontrols.
There may be LongJoin's part number for this photocontrol on the top. I have noticed sometimes with photocontrols they manufacture for other companies like Tork, their part number is on top. It would be a JL- part number. Probably JL-205.