Can iguanas live off of UVA lights?

i just got a very healthy baby iguana, i know alot about iguanas because I have been reasearching them for a couple weeks. but im still stumped on the question if i NEED a UVB light in their baskin. I have a good UVA lighting.....but im still not sure. please help! (Zylah is his/her name, i dont know if its a boy or girl yet.)