Jason - Thanks. I've got a nylon fish tape so can easily get the light in. I just wanted to know if I should try to keep the conduit dry, or if flooding was OK. I'm not even sure the electrician glued the fittings together - espeically where it necks down from PVC to the grey conduit.
Brownsburg - Letting water into conduit is not going make it more difficult to fish the wire. If anything, it might make it easier by lubricating the cable. But that's not a concern because I've already fished one through the longest run which is my spa - for that, I drained it into the pool. I did not buy their special tool as I have a spanner wrench.
I've now had 4 of these Savi Melody lights flood. The first one was just a couple weeks after the build in the spa, and the PB was able to get me a new one, which I replaced. Now, that one plus the 2 in the pool have flooded. The company sent me 3 new ones. These are a different design than the older model. Instead of the electronics in a separate housing, everything is in a single housing. Google Savi Melody images and you'll see the old style. Anyway, I still was not confident in their connector where the cable goes into the housing, so I've potted the ends with industrial 2 part epoxy which I use routinely at work. So hopefully, none of these will flood.
By the way, 2 still work while partially flooded. When the one started going crazy, I jumped in with a mask and saw it had water. Checked the others and they did too.
I'll post photos when I've pulled them.