It's amazing how different the thinking about UVB seems to be on each side of the Atlantic. Over here denying almost ANY captive animal UVB is considered outdated and in some cases almost if not entirely abusive! There are very few serious keepers or breeders who don't use it here these days. When I first started out there was no such thing available to freely purchase, we're very lucky that that's not the case any more.
There's a huge amount of anecdotal evidence among keepers as well as a number of studies that demonstrate the benefits of UVB. We should be trying as closely as possible to recreate the natural environment for our charges and skimping on something as fundamentally important as sunlight for the sake of the cost of a bulb really is unnecessary and quite against the grain of modern husbandry techniques.
With the exception of animals that genetically would be harmed by UVB (albinos for example), PLEASE provide it along with adequate cover and shelter for the animal to self-regulate. I can absolutely vouch for my own observations in the difference that it makes to the well-being of captive tree frogs.