Yes.

Yes, I use TL LD1100's with this mounting all the time

Yes, it does. That's the one I have in there.

Yes - I have used it for this myself.

Yes it fits well. I use it with my LD-1100 and it has a very solid secure grip on the light.

yes

The pack comes with the mount, 2 screws and 2 cable ties. Depending on the width of the fixing holes on your pannier depends on which you use (50mm hole width = screws, any wider = cable ties).
Simply hold mount to rack, and either put screws in from the back into the mount or attach with the cable ties. Mounting instructions are included as well.

Two zip ties and two stubby slf-threading screws are supplied which can be screwed back through the carrier into the bracket. The mount fitted the holes on my Cannondale carrier and the screws feeel very secure. I would prefer to drill holes than use the zip ties.

Both screws and zip-ties are provided, so you can use the latter if the holes on the mount don't exactly align with those on your rack.

Most racks have mounting points at the rear, usually elongated holes which allow for differing brackets widths. Just screw on from behind with the screws that are supplied.

Two screws supplied with the bracket hold it to the rack. I have slotted holes on my rack so the fixing spacing wasn't a problem.

It comes with a bunch of screw holes. Hopefully, you can align these with relevant holes in your rack.

Yes. I have used it myself.

Yes, I bought this attachment for the TL-LD610 Cateye light I purchased and it fits perfectly

Yes

Worked ok for mine.

Yes, you remove the flextight mount and the remaiing square bracket slides straight in and locks.

50mm

50mm iirc, the supplied zip ties are for if you've 80mm holes on your rack

No

Yes, but you will probably have difficulty fitting and removing the light because of constricted space to slide it.

It depends if you have two holes available to fit the mounting to and the space between them.

Sure, no problem!

A bit late but...

Providing your Cateye light has the standard square retainer clip on the back (I imagine all do - the 3 Cateye lights I've bought all have them) it will fit into the pannier fitting clip.