DD thanks for the info.
I realized earlier tonight, I really ought to go out there early tomorrow morning (off work, yay! ) and drop the water level, then take out the light. That way I can measure it and the niche to make sure of the size and so forth before buying the new light.
The incandescent lights are around $200 and the white LEDs are around $400 it looks like. Complicating factor, my mom is fairly adamant about paying for everything herself due to inheritance issues between me and my siblings, and this is a rather touchy subject with her, I think I mentioned she is 90 years old. Mainly I want her to have a lovely fixed up house and pool to live in so she can enjoy life as much as possible. Why not after all, she deserves it. But she doesn't want me to pay for stuff and well you know how some senior citizens can get, let's just call it temperamental about some things shall we ?
So after making sure of the size of niche and compatibility, I will decide on a light and order or just buy it. I like to patronize local businesses, but some of their prices can be exorbitant, and sometimes they have to order the items anyway.
Bob says when I get the light and everything is set, he'll come over that afternoon and we'll trench down and install it. Really now, the local pool stores quoted me $1200 and $1700 to do this (it did include the light though).
Question: What else do I need ? Potting compound for internal bonding wire? Is this actually the same thing as a ground wire or not exactly the same thing ? Do you use conduit lubricant for pulling wire/cable ? Should I buy a light switch ? Do I need a tube of sealant type stuff for where the cord goes into the conduit, or is it actually OK for water to be in the conduit, given the cord is already permanently attached to light ? Should there be a little rubber gasket/plug where the cord goes into the conduit to keep water out ?
And so forth, I know, lots of questions, huh ?
:sunny:
Thank you !
PS Found the table for filters, have seen similar info before which is consistent with that.
Question -- I could just copy current plumbing setup and substitute in new components, for the most part, except that the valves on the new filter would be different. But, would it be better to design it out on paper? I'm not quite sure where to start with that or if it is not necessary. What I mean by copy current setup is just put pump and filter in same places. I don't think I want to use the aux pump but instead lose that type of cleaner. I actually had fun vacuuming today.

Maybe a robot is in the future ?
About putting the filters back into the cylinder, oh boy that was fun, until I figured out how to do it. Basically assemble it upside down outside the cannister, then turn it sideways to put the nuts on the threaded bolts to tie it together. Then put the whole assembly into the cylinder together.
Only took me an hour+ to figure out that easy way to do it, well live and learn, if someone had just showed or told me it would have been a piece of cake.