I use these on a turtle tank. I greatly prefer the clamp lights menards sells. They use a different clamp and it sits on the tank much better. Works great from "nano" tanks as well.
I can'd find a picture of one so I will ahve to take one later. the Clamp looks "cleaner" than the normal ones, too.
Which one do you use:
I purchased a goose neck floor lamp from Home Depot, but I needed to reinforce it with PVC because the LED I'm using is too heavy. I might try a clamp light for additional lighting.