I would love to see an in-depth and more recent study on these bulbs. Even on a number of different species of animal, not just tortoises. I've used both coils and bars for my critters (have leopard geckos and bearded dragons too). I've never really noticed any issue or difference in any of my critters -- it was just a monetary and personal decision that I've ended up using the Zoo-Med bulbs that are all-in-one basking and UVB bulbs.
And still a very valid, useful topic.....
This is another one of those revived old threads.
I also do not recommend anyone use them at all.
There must be two dozen posts where I've warned a new member about the possibility of harm and most of them also decided that any risk is too much. Since other, purely safe options are available.
There is a risk and it's too large for me.
I thought you knew where I stood.
We're on the same side here.
Yeah, for mine they caused minor eye issues. I was luckily able to take them away in timeThis is from 2006-2007.
No matter what any study says, either pro or con, no one can erase what so many of have seen first hand. There is NO doubt in my mind that some of these bulbs cause problems some of the time. I'd love to see a study demonstrating specifically what causes the issue and why it is so random, but absent that, there is still definitely a problem. Even now in 2014.