I use just plain 2x4's cut just long enough not to fall in the tank on each end then set the shop light on top of them...works great and they are not fixed so they can be easily moved if need be.
Stacy
If you didn't care if it was see through or not you could get a piece of PVC pipe (say 2") then find a part that would make the 2" pvc down to a 1" or 1/2"...then attach some kind of flexible tubing to that...just a thought!
Stacy