I got the 2 13" sticks for a 20g long that has a low profile Tetra lid. I was very surprised at how easy it was to install the white & blue LED light stick. It is tightly clamped and does not impede closing the lid. And it lights my aquarium beautifully. Love it when things come together perfectly!
Tried on my vivarium (12 x 12 x 18Ht). was not bight enough. doubt it would be for many things. the penatrance is too low. may be alright for low light wishes. otherwise, OK.
I love it. And my glow fish love it too. Is great for night time and also I have life pants so I use the other white light for my plants as a day light.
This fits under the hood of my old florescent light system. I don't like how bulky the cord and switch are, but other than that its a good light.