it's not necessary, but if you have the money then go for it. uvb will NEVER harm an animal and benefits them in many ways. it helps them metabolize, stimulates breeding, enhances color, helps the tads develop, increases activity.
OTOH you can sucessfully keep and breed them with out it.



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RES
WTF
FBT
Russian Tortoise
Hingeback tortoise
Leos
Lawsons Dragon
Aussi
Ocelot Gecko
0.0.3 Vietnamese Mossy Treefrogs
Oregon Newt
Japanese FBN
American Bullfrog
0.0.4 D. tinctorius
D. auratus
D. leucomelas
1.1D. imitator
0.0.2 imitator intermedius
1.1.1D. lamasi
Grandis Day Gecko
Mali Uro
0.0.4 Hourglass Treefrogs
Conehead lizard
Painted Turtle
Hedgehog, bunnies, dog, fish, crawfish...