Lighting – How many lumens needed to light up a lawn using floodlights

It looks as though you could actually pull this off without drilling/cutting extra holes. Yes you just drill the holes. Keep them up from the bottom, or from the top about 2" so no fasteners from the floor or drywall or plaster is hit.

I have used 3/4" bits for easy holes to pull wire through and up to 1 1/2" bits for more difficult fishing, as in threading a needle from 2 ft away. If the threading kit you speak of are fiberglass rods you connect together, these are perfect for this.

If the location of the new holes are relatively accurate how they are oriented to the joists, with care and a few drill extensions you could drill so the end of the bit can be used to pull a wire back through. It will take extra patience to do so but it can be done.

You could also use to fish tapes, or your threading kit, I presume, if you had help to send one out through the blue hole and cross it with another from the other holes, or you could go at the angle in one shot. I would assume you would pull the box at the blue location.

Here is a little sketch using you drawing to show what I would do.

From the blue hole drill 4 holes in line as best as you can with the other lights. Feed 2 wires to the fist light, one is supply, the other goes to the next light, after that it should be simple using the blue location to redirect the wires you pull to finish the remainder in that area. The rest you will need to thread.

Those typically act as temporary rain water water storage tanks. The idea being to limit the demand on the sewer system during storms. The water is allowed to back-up in those pits and drain more slowly to the sewer system. They may also be used in high water table areas to collect and drain the water table before the water enters your house during the rainy or snow melt season.

You have a few choices.

You could fill it with rocks, but that would take away a lot of volume and defeat the purpose of the pit so I do not recommend it. That may also be against code in your area.

You could cover it with a grating, perhaps made from metal fencing materials or a custom grating, but that wont look that wonderful and is a pain to clean out leaves, blown in trash, or someone's cigarette butts...grrr.

You could, put a fence around it to stop folks from falling in, but again, that's a bit of an eyesore and the cleaning issue.

Personally I'd cover it entirely, leaving an air hole in the side and access to the maintenance pipe cap shown in the image. Perhaps composite decking or some other material, then make a feature out of it with planters.

My personal, preferred solution would be to turn the "decking' into a box, that is make the entire decking one big attractive planter over the open box. Would be a fun project too :) I'd make the sides of the box match the cladding I see on the wall behind. I'd also extend the maintenance pipe up through the box so you can get at it without having to remove the planter. Maybe have it end just under planter soil level.