[Ozric Jonathan]

Hi John. Yes it is useful - for me at least. I think you are saying that we shouldn't 'blast' the whole enclosure with the light from the tubes and that the tortoise should have options to expose themselves to different levels of uv without having to be cold to avoid it. So we have to be thoughtful about how we design the habitat.

I personally do provide uv lighting and think it's beneficial and important for my tortoises when they are indoors.

Thanks for your taking the time to add to the discussion and I'll read over your post again later when I have more time.