I hate to be a Debbie downer but this is not a good idea for vivariums and its hard for me to see a scenario where it is, that would not have a better solution.
What makes LEDs better than other lights is the fact that they are directional. Wrapping them around a tube literally takes the biggest advantage that LEDs have and reverses it to make them have the disadvantages of fluorescent lights.
Remember the days of fluorescent lights? People spent a great deal of effort and money to try to get the best reflectors to reflect more of the light down and waste less of it. But no matter what they bought or how much they spent light was still wasted.
LEDs are efficient and just so happen to direct all the light into the vivarium and that makes them even more efficient in certain scenarios, IE vivariums, street lights or ceiling lights where you have no interest in shining the light in more than one direction.