What I ended up doing was taking the top part of the PVC terrarium off and made my own U shaped hole. I used a drill to make two holes and then used a knife to straighten it out. It's not very pretty but no one will see it and that way there's not a big hole on top of the terrarium.
These lights are definitely bright. Since snakes don't see the color red, you can switch the color to enjoy night watching.
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