I'm thinking about getting a lens kit for my HHA optimizer-lite sight to use for indoor league and don't know to get the 2 or 4 power any recommendiations? also do they work good for 3-d and hunting also?

Get the 4X and then get a Super Peep with a 2x clearifing lens....

I use a 6x lens for spots and 3d with a number 2 clarifier.
When I was using the 4x lens I had the number 1 clarifier, spose it really boils down to how your eyes are.

As for the peep I use the Speciality Archery Hooded ball peep with a 1/4" apeture

Have you guys ever hunted with a lens? How would that work out?

I can answer that in one word they suck

When hunting I prefer to see the big picture and not just a bunch of brown through the scope

I agree with Ausie. The distances shot for hunting just don't justify any magnification.Too muc loss of FOV. Couple that with the fact that light passing through a lens is diminished can make things worse. Rain or snow on a lens makes them totally worthless as does possible reflection or dust. Just too much going on for a hunting rig.

Target and 3D is fine where conditions are controllable.