Mk125

I’d like to use the MK125 but require the LED to come on when it is light and go out when its dark. How can this be done.?

How many LED’s could I add to the circuit board without changing too much?

Many thanks

Swap (-) and (+) of the op-amp. Please perform a search on this board, this matter has already been discussed.
Relay supports several amps so you can connect many led to the relay output.